Motors, compressors, and cooling equipment

Abstract

This application discloses a motor, a compressor and a cooling device, the motor including a rotor, the rotor having 2P mounting grooves, the 2P mounting grooves spaced apart along the circumferential direction of the rotor, permanent magnets mounted in the mounting grooves, both ends of the mounting grooves having magnetic barrier regions that extend beyond both ends of the permanent magnets, recessed structures provided at intermediate positions on the outer edge of the rotor corresponding to two adjacent mounting grooves, magnetic shielding bridges formed between the recessed structures and the magnetic barrier regions of the two corresponding mounting grooves, the angle between the connection line between each of the adjacent ends of the two recessed structures and the center of the rotor is θ, where θ ≥ 180° / (2P).

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application with application number 202310295797.1 filed on March 22, 2023, and all of its content is incorporated herein by reference.

[0002] This application relates to the technical field of cooling equipment, and particularly to motors, compressors, and cooling equipment.

Background Art

[0003] In recent years, due to the strong development of clean energy and new energy vehicles, permanent magnet synchronous motors based on neodymium iron boron magnets have obtained a wider range of applications, the demand for rare earth materials in the world market has increased significantly, and the prices of rare earth elements have also risen substantially. Neodymium iron boron magnets are one of the three important materials for permanent magnet motors. With the increase in the prices of rare earth elements, the cost of motor materials has also increased. Therefore, how to improve the utilization rate of magnets and give full play to the material properties of magnets as much as possible is an urgent and continuous issue in motor design.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The main object of this application is to propose a motor aimed at improving the utilization rate of magnets.

Means for Solving the Problems

[0005] To achieve the above object, the motor according to this application is The rotor includes 2P mounting grooves, the 2P mounting grooves are spaced apart along the circumferential direction of the rotor, permanent magnets are mounted in the mounting grooves, both ends of the mounting grooves have magnetic barrier regions that extend beyond the ends of the permanent magnets, recessed structures are provided at intermediate positions on the outer edge of the rotor corresponding to two adjacent mounting grooves, and magnetic shielding bridges are formed between the recessed structures and the magnetic barrier regions of the two corresponding mounting grooves. The angle between the connecting line between each of the two adjacent recessed structures and the center of the rotor is θ, where θ ≥ 180° / (2P).

[0006] In one embodiment, the motor further includes a stator, the stator having Q stator teeth spaced apart along the circumferential direction of the stator, where θ < 360° / Q.

[0007] In one embodiment, the recessed structure includes a first recessed groove provided between two adjacent mounting grooves.

[0008] In one embodiment, the recessed structure further includes second recessed grooves provided at opposing ends of the mounting groove, and the first recessed groove is provided at a distance from the second recessed groove.

[0009] In one embodiment, the opposing contours of the first groove and the magnetic barrier region are arranged parallel to each other, and / or The contour of the second groove adjacent to the mounting groove is provided parallel to the contour of the magnetic barrier region.

[0010] In one embodiment, the magnetic shielding bridge includes a first bridge segment, a second bridge segment, and a third bridge segment connected in sequence, wherein the first bridge segment is formed between the first groove and the magnetic barrier region, and the third bridge segment is formed between the second groove and the magnetic barrier region, and the first bridge segment, the second bridge segment, and the third bridge segment are provided with equal widths.

[0011] In one embodiment, the outer contour of the second bridge segment is recessed relative to the outer contour of the rotor, or the outer contour of the second bridge segment overlaps with the outer contour of the rotor.

[0012] In one embodiment, the first bridge segment, the second bridge segment, and the third bridge segment are connected by a curved transition.

[0013] In one embodiment, the mounting groove is provided close to the outer edge of the rotor.

[0014] In one embodiment, Q=12 and 2P=10.

[0015] In one embodiment, the mounting groove further includes a magnet region, the permanent magnet is provided in the magnet region, the angle formed by the connecting line between both ends of the magnet region and the center of the rotor is β, the width of the permanent magnet is bM, the outer diameter of the rotor is D, and bM ≤ (D-1)*sin(β / 2) ≤ bM + 0.2.

[0016] In one embodiment, 11 mm ≤ bM ≤ 14 mm.

[0017] In one embodiment, the magnetic region is a straight groove, and the central part of the magnetic region is perpendicular to the diameter of the rotor.

[0018] This application further proposes a compressor including the motor described above.

[0019] This application further proposes a cooling device including the compressor described above.

[0020] To more clearly explain the technical solutions in the embodiments of this application or the prior art, the drawings that need to be used in the following description of the embodiments or the prior art are briefly introduced. Obviously, the drawings in the following description are only some embodiments of this application, and for those skilled in the art, based on the structures shown in these drawings, other drawings can be obtained without creative labor.

Brief Description of the Drawings

[0021] [Figure 1] It is a schematic structural diagram of a stator in an embodiment of the motor of this application. [Figure 2] It is a schematic structural diagram of a rotor in the motor of FIG. 1. [Figure 3] It is a partial enlarged view of part A in FIG. 2. [Figure 4] It is a schematic structural diagram of a rotor in another embodiment of the motor of this application. [Figure 5] It is a partial enlarged view of part A in FIG. 4.

[0022] Regarding the realization of the purpose, functional features and advantages of this application, further explanations will be made in conjunction with the embodiments and referring to the drawings.

Modes for Carrying Out the Invention

[0023] Hereinafter, in conjunction with the drawings of the embodiments of this application, the technical solutions of the embodiments of this application will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of this application.

[0024] In the embodiments of this application, if directional indicators (e.g., up, down, left, right, front, back, etc.) are involved, these directional indicators are merely for interpreting the relative positional relationships and motion conditions between each component in a specific orientation (as shown in the drawings), and if that specific orientation changes, the directional indicators will also change accordingly.

[0025] Furthermore, in the embodiments of this application, if there are descriptions of "first," "second," etc., these descriptions are merely descriptive and should not be understood as indicating or implying their relative importance or implicitly indicating the number of technical features being referred to. Thus, features limited by "first" and "second" may explicitly or implicitly include at least one such feature. Also, "and / or" appearing throughout the specification includes three parallel schemes, and taking "A and / or B" as an example, it means including scheme A, or scheme B, or a scheme that satisfies both A and B simultaneously. In addition, while the technical solutions between each embodiment can be combined with each other, this must be based on the fact that they can be realized by a person skilled in the art. If a combination of technical solutions results in a contradiction or is not feasible, then such a combination of technical solutions should be considered nonexistent and is not within the scope of protection required by this application.

[0026] This application proposes a motor.

[0027] In the embodiments of this application, as shown in Figures 1 to 5, the motor includes a rotor 110, the rotor 110 has 2P mounting grooves 111, the 2P mounting grooves 111 are spaced apart along the circumferential direction of the rotor 110, permanent magnets 120 are mounted in the mounting grooves 111, both ends of the mounting grooves 111 have magnetic barrier regions 112 that extend beyond both ends of the permanent magnets 120, recessed structures 113 are provided at intermediate positions on the outer edge of the rotor 110 corresponding to two adjacent mounting grooves 111, magnetic shielding bridges 114 are formed between the recessed structures 113 and the magnetic barrier regions 112 of the two corresponding mounting grooves 111, the angle between the connection line between each of the two adjacent recessed structures 113 and the center of the rotor 110 is θ, and θ ≥ 180° / (2P).

[0028] Specifically, the rotor 110 is mounted on the inner circumference of the stator 130, and a plurality of stator teeth 131 are formed on the inner circumference of the stator 130 at intervals, with a stator groove 133 formed between two adjacent stator teeth 131, and the stator winding is wound around the stator teeth 131, passing through the stator groove 133. The ends of the stator teeth 131 facing the axis of the stator 130 have tooth shoes 132, and when the stator winding is energized, the stator winding generates an armature magnetic field, which is transmitted to the rotor 110 along the tooth shoes 132 of the iron core of the stator 130. A permanent magnet 120 is provided in the mounting groove 111, which can generate a permanent magnet magnetic field, and the permanent magnet magnetic field and the armature magnetic field interact to generate electromagnetic torque, which in turn can rotate the rotor 110. Both ends of the mounting groove 111 have a magnetic barrier region 112 that extends beyond both ends of the permanent magnet 120. This magnetic barrier region 112 and the outer edge of the rotor 110 together form a magnetic shielding bridge 114. The longer the magnetic shielding bridge 114, the less magnetic leakage from the permanent magnet 120 through the magnetic shielding bridge 114. Consequently, the permanent magnet magnetic field generated by the rotor 100 becomes stronger. In other words, the longer the magnetic shielding bridge, the fewer permanent magnets are needed to generate the same electromagnetic torque, improving the motor's performance. To extend the magnetic shielding bridge structure, recessed structures 113 are provided at intermediate positions on the outer edge of the rotor 110 corresponding to two adjacent mounting grooves 111. These recessed structures 113 are positioned approximately opposite the magnetic barrier regions 112 of the two adjacent mounting grooves 111, thereby extending the magnetic shielding bridge 114 structure. These recessed structures 113 are positioned symmetrically with respect to the q-axis of the rotor 110. To ensure sufficient magnetic shielding effect and transmission efficiency between the rotor 110 and the stator 130, the length of the magnetic shielding bridge 114 must be sufficiently long, and the length of the corresponding recessed structure 113 must also be sufficiently long. However, if the extension distance of the magnetic barrier groove along the d-axis is too long, on the one hand, the permanent magnet 120 will erode the silicon steel space through which the permanent magnet magnetic field is transmitted to the stator 130, and on the other hand, the length of the corresponding recessed structure 113 will increase.Since the width of the magnetic shielding bridge 114 depends on the thickness of the corresponding rotor's perforated sheet (the width of the magnetic shielding bridge 114 is greater than or equal to the thickness of the rotor's perforated sheet), in order to ensure the width of the magnetic shielding bridge 114, the radial depth of the corresponding recessed structure 113 on the rotor 110 also increases accordingly, increasing the corresponding equivalent air gap, decreasing the main magnetic flux, and reducing the motor's efficiency. Therefore, the angle between the connecting line between each of the two adjacent ends of the recessed structure 113 and the center of the rotor 110 is θ, where θ ≥ 180° / (2P).

[0029] Of these, the magnetic barrier region 112 is provided at both opposing ends of the mounting groove 111 and is in communication with the mounting groove 111. In other embodiments, the magnetic barrier region 112 may be provided at a distance from the mounting groove 111. In this embodiment, the plurality of stator teeth 131 are uniformly arranged along the circumferential direction of the stator 130, and / or the plurality of mounting grooves 111 are uniformly arranged along the circumferential direction of the rotor 110.

[0030] In the proposed design, two P mounting grooves 111 are provided spaced apart along the circumferential direction of the rotor 110, and the permanent magnets 120 are mounted in the mounting grooves 111. Both ends of the mounting grooves 111 have magnetic barrier regions 112 that extend beyond both ends of the permanent magnets 120. A recessed structure 113 is provided at an intermediate position on the outer edge of the rotor 110 corresponding to two adjacent mounting grooves 111, and a magnetic shielding bridge 114 is formed between the recessed structure 113 and the magnetic barrier regions 112 of the two corresponding mounting grooves 111. The longer the structure of the magnetic shielding bridge 114, the greater the effect in reducing magnetic leakage. In order to ensure sufficient magnetic shielding effect and thus ensure transmission efficiency between the rotor 110 and the stator 130, the length of the magnetic shielding bridge 114 must be sufficiently long, and the length of the corresponding recessed structure 113 must also be sufficiently long. However, if the extension distance of the magnetic barrier groove along the d-axis is too long, on the one hand, it will encroach on the space in the silicon steel through which the permanent magnet 120 transmits the main magnetic flux to the stator 130, and on the other hand, the length of the corresponding recessed structure 113 will increase. Since the width of the magnetic shielding bridge 114 depends on the thickness of the corresponding rotor's perforated sheet (the width of the magnetic shielding bridge 114 is greater than or equal to the thickness of the rotor's perforated sheet), in order to ensure the width of the magnetic shielding bridge 114, the radial depth of the corresponding recessed structure 113 on the rotor 110 also increases accordingly, increasing the corresponding equivalent air gap, reducing the main magnetic flux, and lowering the motor's efficiency. Therefore, the angle between the connecting line between each of the two adjacent ends of the recessed structure 113 and the center of the rotor 110 is θ, where θ ≥ 180° / (2P), and the magnetic shielding bridge 114 has an appropriate length, thereby ensuring the efficiency of main magnetic flux transmission, improving the utilization rate of the permanent magnet 120, and improving the motor's operating efficiency.

[0031] Furthermore, the motor further includes a stator 130, which includes Q stator teeth 131 spaced apart along the circumferential direction of the stator 130, where θ < 360° / Q. Specifically, in order to reduce the effect of magnetic leakage and improve the transmission efficiency of the main magnetic flux, the magnetic shielding bridge 114 must have a minimum value, where the angle between the connection line between each of the two adjacent recessed ends of the two recessed structures 113 and the center of the rotor 110 is θ, where θ < 360° / Q, thereby ensuring the shortest possible length of the magnetic shielding bridge 114 and thus ensuring a sufficient magnetic shielding effect, thereby ensuring the transmission efficiency between the rotor 110 and the stator 130.

[0032] In one embodiment, referring to Figures 2 to 4, the recessed structure 113 includes a first recessed groove 113a provided between two adjacent mounting grooves 111. Specifically, the first recessed groove 113a is provided on the q-axis of the rotor 110, between two adjacent mounting grooves 111, and is provided opposite the magnetic barrier region 112 of the mounting groove 111, with a magnetic shielding bridge 114 formed between the first recessed groove 113a and the magnetic barrier region 112.

[0033] Furthermore, in one embodiment, the opposing contours of the first groove 113a and the magnetic barrier region 112 are arranged parallel to each other. Specifically, the opposing contours of the first groove 113a and the magnetic barrier region 112 are arranged parallel to each other, thereby making the width of the magnetic shielding bridge 114 formed between the first groove 113a and the magnetic barrier region 112 more uniform (the width of the magnetic shielding bridge 114 is greater than or equal to the thickness of the rotor's punching sheet), thereby improving the magnetic shielding effect and ensuring transmission efficiency between the rotor 110 and the stator 130.

[0034] In another embodiment, the recess structure 113 further includes second recesses 113b provided at opposing ends of the mounting groove 111, with the first recess 113a spaced apart from the second recess 113b. Specifically, the second recesses 113b are located at opposing ends of the mounting groove 111, the first recess 113a is spaced apart from the second recess 113b, the second recesses 113b are provided on both opposing sides of the first recess 113a, the second recesses 113b are provided at least opposite the magnetic barrier region 112 of the mounting groove 111, and a magnetic shielding bridge 114 is formed on the side of the second recess 113b facing the mounting groove 111. Therefore, in order to increase the length of the recess structure 113, the second recess needs to be translated toward the D axis, which in turn increases the area of ​​the second groove 113b, increases the depth of the second groove 113b along the radial direction of the rotor 110, and increases the equivalent air gap length accordingly.

[0035] Furthermore, the contour of the second groove 113b adjacent to the mounting groove 111 is provided parallel to the contour of the magnetic barrier region 112. Specifically, the contour of the second groove 113b adjacent to the mounting groove 111 is parallel to the contour of the magnetic barrier region 112, which makes the width of the magnetic shielding bridge 114 formed by the contour of the second groove 113b adjacent to the mounting groove 111 and the contour of the magnetic barrier region 112 more uniform (the width of the magnetic shielding bridge 114 is greater than or equal to the thickness of the rotor's punching sheet), thereby improving the magnetic shielding effect and ensuring transmission efficiency between the rotor 110 and the stator 130.

[0036] Referring again to Figures 2 to 5, in one embodiment, the magnetic shielding bridge 114 includes a first bridge segment 114a, a second bridge segment 114b, and a third bridge segment 114c, which are connected in order. The first bridge segment 114a is formed between the first groove 113a and the magnetic barrier region 112, and the third bridge segment 114c is formed between the second groove 113b and the magnetic barrier region 112. The first bridge segment 114a, the second bridge segment 114b, and the third bridge segment 114c are provided with equal widths. Specifically, the first bridge segment 114a, the second bridge segment 114b, and the third bridge segment 114c are connected in order to form a magnetic shielding bridge 114, thereby improving the magnetic shielding effect and ensuring transmission efficiency between the rotor 110 and the stator 130. The first bridge segment 114a is formed between the first groove 113a and the magnetic barrier region 112, and the third bridge segment 114c is formed between the second groove 113b and the magnetic barrier region 112. That is, each of the opposing sides of the first groove 113a and the contour of the mounting groove 111 form the first bridge segment 114a, and the side of the second groove 113b adjacent to the mounting groove 111 and the contour of the mounting groove 111 form the third bridge segment 114c. The second bridge segment 114b is used to connect the first bridge segment 114a and the third bridge segment 114c to form one complete magnetic shielding bridge 114 structure. The first bridge segment 114a, the second bridge segment 114b, and the third bridge segment 114c are provided with equal widths, thereby ensuring a more uniform width for the magnetic shielding bridge 114 (the width of the magnetic shielding bridge 114 is greater than or equal to the thickness of the rotor's punching sheet), thereby improving the magnetic shielding effect of the magnetic shielding bridge 114 and ensuring transmission efficiency between the rotor 110 and the stator 130.

[0037] Furthermore, the first bridge segment 114a, the second bridge segment 114b, and the third bridge segment 114c are connected with a curved transition. This ensures that the width of the magnetic shielding bridge 114 is more uniform (the width of the magnetic shielding bridge 114 is greater than or equal to the thickness of the rotor's punching sheet), thereby improving the magnetic shielding effect and ensuring transmission efficiency between the rotor 110 and the stator 130.

[0038] In one embodiment, referring to Figures 4 and 5, the outer contour of the second bridge segment 114b is recessed relative to the outer contour of the rotor 110. The width of the magnetic shielding bridge 114 typically depends on the thickness of the rotor's perforated sheet, which is typically 0.3 mm, 0.35 mm, and 0.5 mm. In this embodiment, the thickness of the rotor's perforated sheet is set to 0.5 mm. Accordingly, the width of the magnetic shielding bridge 114 should be set as close to 0.5 mm as possible. Therefore, when the mounting groove 111 is far from the outer edge of the rotor 110, the depth of the first groove 113a and the second groove 113b along the radial direction of the rotor 110 increases in order to secure the width of the magnetic shielding bridge 114. Accordingly, it is necessary to reduce a portion of the second bridge segment 114b or decrease the length of the second bridge segment 114b. The axial depth of the recessed structure 113 on the rotor 110 also increases accordingly, which increases the equivalent air gap, decreases the main magnetic flux, and reduces the efficiency of the motor.

[0039] In another embodiment, referring to Figures 2 and 3, the outer contour of the second bridge segment 114b is provided to overlap with the outer contour of the rotor 110. Specifically, in this embodiment, the width of the magnetic shielding bridge 114 typically depends on the thickness of the rotor's perforated sheet, which is typically 0.3 mm, 0.35 mm, and 0.5 mm. In this embodiment, the thickness of the rotor's perforated sheet is 0.5 mm, and accordingly, the width of the magnetic shielding bridge 114 should be set as close to 0.5 mm as possible. Therefore, when the mounting groove 111 is close to the outer edge of the rotor 110, in order to secure the width of the magnetic shielding bridge 114, the depth of the first groove 113a and the second groove 113b along the radial direction of the rotor 110 decreases accordingly, the length of the second bridge segment 114b is extended accordingly, and the axial depth of the recessed structure 113 on the rotor 110 also increases accordingly. As a result, the equivalent air gap decreases, the main magnetic flux increases, and the efficiency of the motor increases.

[0040] In one embodiment, the mounting groove 111 is provided close to the outer edge of the rotor 110.

[0041] Referring to Figures 1 to 5, in one embodiment, Q = 12 and 2P = 10. That is, in this solution, the motor adopts a 12-slot 10-pole design, and compared to solutions that adopt 9-slot 6-pole and 12-slot 8-pole designs, the 12-slot 10-pole motor can significantly improve the efficiency of the motor.

[0042] In one embodiment, the mounting groove 111 further includes a magnet region 115, and a permanent magnet 120 is provided in the magnet region 115, the angle formed by the connecting line between both ends of the magnet region 115 and the center of the rotor 110 is β, the width of the permanent magnet 120 is bM, the outer diameter of the rotor 110 is D, and bM ≤ (D-1)*sin(β / 2) ≤ bM + 0.2. Specifically, since the mounting groove 111 is provided close to the outer edge of the rotor 110, the arc of the outer edge of the magnetic shielding bridge 114 that directly contacts the magnetic barrier region 112 is the outer contour of the rotor 110, i.e., the outer contour of the second bridge segment 114b is provided overlapping with the outer contour of the rotor 110. The area of ​​the first groove 113a and the second groove 113b is reduced, and accordingly the amount of silicon steel material removed for the recessed structure 113 is reduced, and the equivalent air gap is reduced. However, the closer the mounting groove 111 is to the outside, the more its length is limited by the chord length of the rotor 110, and the mounting groove 111 includes magnetic barrier regions 112 at both ends and magnet regions 115 located in the two magnetic barrier regions 112, and the permanent magnet 120 is mounted in the magnet region 115. Since (D-1)*sin(β / 2) is the length of the straight side of the outer contour of the magnet region 115 in the mounting groove 111, bM ≤ (D-1)*sin(β / 2) ≤ bM + 0.2, so that the width of the magnet region 115 is slightly larger than the width of the permanent magnet 120, but smaller than the width of the permanent magnet 120 bM + 0.2 mm. Thus, the mounting groove 111 has a sufficient magnetic shielding effect and a sufficiently small equivalent air gap length, the rotor 110 and stator 130 have sufficient transmission efficiency, and the motor's operating efficiency is improved. Of these, 11mm ≤ bM ≤ 14mm. In one embodiment, bM = 13mm.

[0043] In this embodiment, the magnet region 115 is a straight groove, and the central part of the magnet region 115 is perpendicular to the diameter of the rotor 110. In this solution, since the motor adopts a 12-slot 10-pole design, the magnet region 115 is provided as a straight groove, and the central part of the magnet region 115 is perpendicular to the diameter of the rotor 110, that is, the mounting groove 111 is provided perpendicular to the d-axis, thereby improving the magnetic collection effect of the permanent magnet 120 and improving the utilization rate of the permanent magnet 120. In order to further improve the width of the magnet region 115, the extending direction of the magnet region 115 is provided at a narrow angle with the extending direction of the magnetic barrier region 112, and the narrow angle is 90° or more and 180° or less. That is, the magnetic barrier region 112 is provided bent in the circumferential direction of the rotor 110 relative to the magnet region 115.

[0044] This application further proposes a compressor which includes a motor, the specific structure of which refers to the above embodiments, and since this compressor adopts all the technical ideas of all the above embodiments, it has at least all the beneficial effects that the technical ideas of the above embodiments bring about, and no further detailed explanation is given here.

[0045] This application further proposes a cooling device which includes a compressor, the specific structure of which refers to the above embodiments, and since this compressor adopts all the technical ideas of all the above embodiments, it has at least all the beneficial effects of the technical ideas of the above embodiments, and no further detailed explanation is provided here.

[0046] The foregoing are merely selectable embodiments of this application and do not limit the scope of this application. Any transformation of equivalent structures created using the contents of the specification and drawings of this application, or any direct or indirect application in other related technical fields, under the inventive concept of this application, are all included within the scope of this application's patent protection. [Explanation of Symbols]

[0047] 110...Rotor, 111...Mounting groove, 112...Magnetic barrier region, 113...Recessed structure, 113a...First recessed groove, 113b...Second recessed groove, 114...Magnetic shielding bridge, 114a...First bridge segment, 114b...Second bridge segment, 114c...Third bridge segment, 115...Magnet region, 120...Permanent magnet, 130...Stator, 131...Stator teeth, 132...Tooth shoe, 133...Stator groove.

Claims

1. It is a motor, The rotor includes 2P mounting grooves, the 2P mounting grooves are spaced apart along the circumferential direction of the rotor, permanent magnets are mounted in the mounting grooves, both ends of the mounting grooves have magnetic barrier regions that extend beyond the ends of the permanent magnets, recessed structures are provided at intermediate positions on the outer edge of the rotor corresponding to two adjacent mounting grooves, and magnetic shielding bridges are formed between the recessed structures and the magnetic barrier regions of the two corresponding mounting grooves. A motor in which the angle between the connecting line between each of the two adjacent recessed structures and the center of the rotor is θ, and θ ≥ 180° / (2P).

2. The motor according to claim 1, further comprising a stator, the stator comprising Q stator teeth spaced apart along the circumferential direction of the stator, wherein θ < 360° / Q.

3. The motor according to claim 1 or 2, wherein the recessed structure includes a first recessed groove provided between two adjacent mounting grooves.

4. The motor according to claim 3, wherein the recessed structure further includes second recessed grooves provided at opposing ends of the mounting groove, and the first recessed groove is provided at a distance from the second recessed groove.

5. The opposing contours of the first groove and the magnetic barrier region are provided parallel to each other, and / or The motor according to claim 4, wherein the contour of the second groove adjacent to the mounting groove is provided parallel to the contour of the magnetic barrier region.

6. The motor according to claim 4 or 5, wherein the magnetic shielding bridge includes a first bridge segment, a second bridge segment, and a third bridge segment connected in order, the first bridge segment being formed between the first groove and the magnetic barrier region, the third bridge segment being formed between the second groove and the magnetic barrier region, and the first bridge segment, the second bridge segment, and the third bridge segment being provided with equal width.

7. The motor according to claim 6, wherein the outer contour of the second bridge segment is recessed relative to the outer contour of the rotor, or the outer contour of the second bridge segment overlaps with the outer contour of the rotor.

8. The motor according to claim 6 or 7, wherein the first bridge segment, the second bridge segment, and the third bridge segment are connected by a curved transition.

9. The motor according to any one of claims 1 to 8, wherein the mounting groove is provided in close proximity to the outer edge of the rotor.

10. A motor according to any one of claims 1 to 9, wherein Q = 12 and 2P = 10.

11. The motor according to any one of claims 1 to 10, wherein the mounting groove further includes a magnet region, the permanent magnet is provided in the magnet region, the angle formed by the connecting line between both ends of the magnet region and the center of the rotor is β, the width of the permanent magnet is bM, the outer diameter of the rotor is D, and bM ≤ (D - 1) * sin(β / 2) ≤ bM + 0.

2.

12. The motor according to claim 11, wherein 11 mm ≤ bM ≤ 14 mm.

13. The motor according to claim 11 or 12, wherein the magnetic region is a straight groove, and the central part of the magnetic region is perpendicular to the diameter of the rotor.

14. A compressor comprising the motor described in any one of claims 1 to 13.

15. A cooling device comprising the compressor described in claim 14.

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