Motor, compressor and air conditioning equipment

Abstract

The present invention discloses a motor, a compressor and an air-conditioning device, relating to the technical field of motors. Among them, the rotor is rotatably arranged in the stator. The rotor is provided with a plurality of magnetic steel grooves in the circumferential direction. The outer magnetic bridges of the plurality of magnetic steel grooves are all arranged in a disconnected manner. The plurality of magnetic steel grooves define a plurality of outer iron cores and an inner iron core located in the middle of the plurality of outer iron cores in the circumferential direction of the rotor. The rotor includes a plurality of rotor punching sheets stacked axially; the plurality of outer iron cores are all connected to the inner iron core through inner magnetic bridges; the minimum width of the inner magnetic bridge is W1, the maximum radial length is L1, and the thickness of the magnet is W m , the thickness of each rotor punching sheet is t s , the angle between the width of the magnetic steel groove in the circumferential direction and the q-axis of the rotor is α, satisfying the relationship: W m / 2 ≥ W1 ≥ t s , 10 * t s ≥ L1 ≥ W m *sinα. The purpose of the present invention is to control the size of the inner magnetic bridge to ensure that the inner magnetic bridge can maintain structural stability and minimize the influence on the magnetic flux path while ensuring the structural strength of the rotor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a motor, a compressor, and an air-conditioning device. Background Art

[0002] The rotor of the motor is provided with magnet slots for installing magnets. To ensure the structural strength of the rotor, the magnet slots are usually provided with outer magnetic bridges. Here, the outer magnetic bridge refers to the part extending from the magnet slot where the magnet is placed to the outer edge of the rotor (the outer magnetic bridge is a small section of material connecting the magnet slot where the magnet is placed and other parts of the rotor). However, the outer magnetic bridge structure will cause magnetic leakage of the magnet, resulting in a decline in the performance of the motor. The degree of magnetic leakage is related to the size and number of the outer magnetic bridges. To reduce eddy current loss, optimize the magnetic field distribution, and improve the heat dissipation performance, sometimes a design with the outer magnetic bridge disconnected is selected. If all the outer magnetic bridges on the outer circumferential side of the rotor are interrupted, the magnetic leakage of the motor magnets can be suppressed, but it also brings problems with the rotor strength. Therefore, it is crucial to balance the suppression of magnetic leakage of the magnet and ensure the rotor strength. Summary of the Invention

[0003] The main object of the present invention is to provide a motor, a compressor, and an air-conditioning device, aiming to control the size (width W1 and length L1) of the inner magnetic bridge, on the basis of ensuring the structural strength of the rotor, to ensure that the inner magnetic bridge can not only maintain structural stability but also minimize the influence on the magnetic flux path.

[0004] To achieve the above object, a motor provided by the present invention includes: a stator, a rotor, and a plurality of magnets disposed in the magnet slots; the rotor is rotatably disposed in the stator, the rotor is provided with a plurality of magnet slots in the circumferential direction, the outer magnetic bridges of the plurality of magnet slots are all disconnected, the plurality of magnet slots define a plurality of outer iron cores and an inner iron core located in the middle of the plurality of outer iron cores in the circumferential direction of the rotor, and the rotor includes a plurality of rotor punching sheets stacked axially;

[0005] Wherein, the plurality of outer iron cores are all connected to the inner iron core through inner magnetic bridges; the minimum width of the inner magnetic bridge is W1, the maximum radial length is L1, the thickness of the magnet is Wm, and the thickness of each rotor punching sheet is t s , the angle between the width of the magnet slot in the circumferential direction and the q-axis of the rotor is α, satisfying the relationship: t s ≤W1≤W m / 2, W m *sinα≤L1≤10*t s .

[0006] In an embodiment, the outer peripheral edge of the rotor is provided with a plurality of open slots opening outward at intervals in the circumferential direction, and the break of the outer magnetic bridge of the magnet slots of two adjacent outer iron cores communicates with the open slot; the minimum distance between the slot openings of the open slot in the circumferential direction is W2, wherein, W m≤W2≤4*W m 。

[0007] In one embodiment, 1.2 mm ≤ W m ≤ 3 mm.

[0008] In one embodiment, the minimum distance from the connection line of the lowest points in the radial direction of the magnetic steel grooves of two adjacent outer iron cores to the opening groove is L2, and the maximum radius of the rotor is R1, 18 ≤ R1 / L2 ≤ 25.

[0009] In one embodiment, 22 mm ≤ R1 ≤ 28.25 mm.

[0010] In one embodiment, the maximum diameter of the stator is R2, and R2 satisfies: 0.48 ≤ (R1 - L2) / R2 ≤ 0.63.

[0011] In one embodiment, the rotor is further provided with a blocking portion, and the blocking portion is arranged at the outer magnetic bridge fracture of the magnetic steel groove to limit the magnet from detaching from the opening groove.

[0012] In one embodiment, two slits are arranged at intervals along the circumferential direction on the outer iron core.

[0013] In one embodiment, a plurality of the rotor punching sheets are all provided with riveting portions, and the plurality of rotor punching sheets are riveted through the riveting portions.

[0014] The present invention also provides a compressor, including the motor as described above.

[0015] The present invention also provides an air-conditioning device, including the motor or the compressor as described above.

[0016] Through controlling the dimensions (width W1 and length L1) of the inner magnetic bridge, the technical solution of the present invention can effectively reduce the magnetic leakage phenomenon, thereby improving the motor efficiency. When the outer magnetic bridge is completely disconnected, a reasonable inner magnetic bridge design can significantly reduce the negative impact brought thereby; it helps to improve the magnetic field distribution, making the magnetic field more uniform, which is beneficial to enhancing the overall performance of the motor, including efficiency, power density, etc.; thus, on the basis of ensuring the rotor structural strength, the connection structure arrangement between the traditional outer iron cores is improved, ensuring that the inner magnetic bridge can not only maintain the structural stability but also minimize the influence on the magnetic flux path as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0018] Figure 1 Schematic structural diagram of an embodiment of the motor provided by the present invention;

[0019] Figure 2 Schematic structural diagram of an embodiment of the rotor;

[0020] Figure 3 Schematic structural diagram of another embodiment of the rotor;

[0021] Figure 4 Schematic structural diagram of yet another embodiment of the rotor;

[0022] Figure 5 Diagram showing the relationship between the overall deformation of the rotor and the width W1 of the inner magnetic bridge;

[0023] Figure 6 Diagram showing the relationship between the magnetic flux and the opening slot W2.

[0024] Explanation of the reference numerals in the drawings:

[0025] 100, stator;

[0026] 200, rotor; 210, magnet slot; 220, outer iron core; 230, inner iron core; 240, inner magnetic bridge;

[0027] 250, opening slot; 260, blocking portion; 270, slit;

[0028] 300, magnet.

[0029] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if the embodiments of the present invention involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] Magnet slots for installing magnets are provided on the rotor of the motor. To ensure the structural strength of the rotor, outer magnetic bridges are usually provided in the magnet slots. The outer magnetic bridges referred to here are the parts extending from the magnet slots where the magnets are placed to the outer edge of the rotor (the outer magnetic bridges are small sections of material connecting the magnet slots where the magnets are placed and the outer edge part of the rotor), but the outer magnetic bridge structure will cause magnetic leakage of the magnets, resulting in a decrease in the performance of the motor. The degree of magnetic leakage is related to the size and quantity of the outer magnetic bridges; in order to reduce eddy current loss, optimize the magnetic field distribution, and improve the heat dissipation performance, sometimes a design with the outer magnetic bridges disconnected is selected. If all the outer magnetic bridges on the outer circumferential side of the rotor are interrupted, the magnetic leakage of the motor magnets can be suppressed, but it also brings problems with the strength of the rotor. Therefore, it is crucial to balance the suppression of magnetic leakage of the magnets and ensure the strength of the rotor.

[0034] The present invention proposes a motor that, on the basis of ensuring the structural strength of the rotor, improves the arrangement of the connection structure between traditional outer iron cores, restricts the magnetic leakage of the magnets by reducing the quantity of the outer magnetic bridges on the outer circle side of the rotor, and improves the utilization rate of the magnets.

[0035] Please refer to Figures 1 to 6 , in an embodiment of the present invention, the motor includes a stator 100, a rotor 200, and a plurality of magnets 300 disposed in the magnet slots 210 of the rotor 200.

[0036] The stator 100 part includes a machine base, a stator core, a stator winding, etc. The machine base is usually made of cast iron or cast steel, and its main function is to support and protect the stator core and winding. The stator core is composed of silicon steel sheets and is used to generate a rotating magnetic field. The stator winding is a coil that generates a rotating magnetic field after being energized and is usually wound with insulated wires and placed in the slots of the stator core. The rotor 200 part includes a rotating shaft, a rotor core, and magnets, etc. The rotating shaft is used to support the rotor and transmit torque. The rotor core is also composed of silicon steel sheets and is used to generate electromagnetic induction. The magnets 300 are placed in the magnet slots 210 of the rotor core and will generate an electromagnetic torque after being energized.

[0037] Referring to Figure 1 , the rotor 200 is rotatably arranged in the stator 100 (inside the stator core). The rotor 200 is provided with a plurality of magnet slots 210 in the circumferential direction. The outer magnetic bridges of the plurality of magnet slots 210 (i.e., the openings of the magnet slots 210 on the outer edge side of the rotor 200) are all disconnected. The plurality of magnet slots 210 define a plurality of outer iron cores 220 and an inner iron core 230 located in the middle of the plurality of outer iron cores 220 in the circumferential direction of the rotor 200. The rotor 200 includes a plurality of rotor laminations stacked axially.

[0038] Referring to Figures 1 to 4 , a plurality of magnets 300 are arranged in the magnet slots 210. Among them, the plurality of outer iron cores 220 are all connected to the inner iron core 230 through an inner magnetic bridge 240. By arranging the inner magnetic bridge 240 between the plurality of outer iron cores 220 and the inner iron core 230, the problem of mechanical strength reduction caused by the disconnection of the outer magnetic bridge can be compensated to a certain extent, allowing the rotor 200 to reduce the magnetic leakage phenomenon caused by the outer magnetic bridge while maintaining a relatively high mechanical strength.

[0039] The minimum width (the width is the straight-line distance between two points in the circumferential direction) of the inner magnetic bridge 240 is W1, and the maximum radial length is L1. The thickness of the magnet 300 is W m (as shown in Figure 1 , multiple segments can be measured and averaged), the thickness of each rotor lamination is t s (the thickness in the stacking direction, multiple segments can be measured and averaged), the angle between the width of the magnet slot 210 in the circumferential direction and the q-axis of the rotor 200 is α (as shown in Figure 1 , the d-axis direction is the magnetic field direction, that is, the magnetic pole axis direction, the q-axis direction is perpendicular to the magnetic field, that is, the horizontal direction, and the q-axis is perpendicular to the d-axis), satisfying the relationship: W m / 2 ≥ W1 ≥ t s , 10 * t s ≥ L1 ≥ W m * sinα. The parameter limitation ensures that the inner magnetic bridge 240 can not only provide sufficient mechanical support but also not overly interfere with the magnetic field distribution. In particular, the relationship between W1 (the minimum circumferential width of the inner magnetic bridge 240) and t s (the thickness of each rotor lamination) ensures that the inner magnetic bridge 240 can maintain structural stability and minimize the influence on the magnetic flux path as much as possible.

[0040] Referring to Figure 5 , Figure 5It is a relationship diagram between the overall deformation of the rotor 200 and the width W1 of the inner magnetic bridge 240; the horizontal axis is W1 (the minimum circumferential width of the inner magnetic bridge 240), and the vertical axis is the overall deformation of the rotor 200. It can be seen from the figure that as the horizontal axis variable increases, the overall deformation of the rotor 200 shows a trend of first rapidly decreasing and then flattening out.

[0041] When W1 is less than t s、 the overall deformation of the rotor 200 is between 30μm and 80μm.

[0042] As W1 is greater than t s the overall deformation of the rotor 200 is approximately between 20μm and 30μm.

[0043] This indicates that in the initial stage, the horizontal axis variable has a greater impact on the overall deformation of the rotor 200, and as the variable increases, this impact gradually weakens. That is, when W1 is within t s ≤W1≤W m / 2 range, the overall deformation of the rotor 200 is optimally controlled.

[0044] The improved scheme reduces the magnetic leakage phenomenon significantly by disconnecting the outer magnetic bridge and introducing the inner magnetic bridge 240 with a specific design, improves the motor efficiency and electromagnetic performance, and ensures that the rotor 200 has sufficient mechanical strength. At the same time, the design of multiple rotor punching sheets based on axial lamination is not only convenient for manufacturing but also optimizes the cost - effectiveness, achieving an overall improvement in the motor performance, reliability, and economy.

[0045] The technical solution of the present invention can effectively reduce the magnetic leakage phenomenon by controlling the dimensions (width W1 and length L1) of the inner magnetic bridge 240, thereby improving the motor efficiency. When the outer magnetic bridge is completely disconnected, a reasonable design of the inner magnetic bridge 240 can significantly reduce the negative impact brought by this; it helps to improve the magnetic field distribution, making the magnetic field more uniform, which is beneficial to enhancing the overall performance of the motor, including efficiency, power density, etc.; thus, on the basis of ensuring the structural strength of the rotor 200, it is ensured that the inner magnetic bridge 240 can maintain structural stability and minimize the influence on the magnetic flux path as much as possible.

[0046] Furthermore, a plurality of opening grooves 250 opening outward are provided at intervals along the circumferential direction of the outer periphery of the rotor 200, and the magnetic bridge break of the magnetic steel grooves 210 of two adjacent outer iron cores 220 communicates with the opening grooves 250; the minimum distance of the groove openings of the opening grooves 250 in the circumferential direction is W2, and W m ≤W2≤4*W m .

[0047] Refer to Figure 6 , Figure 6It is a graph showing the relationship between magnetic flux and W2 of the open slot 250. The horizontal axis represents the ratio of the minimum distance of the open slot 250 being W2, and the vertical axis represents the magnetic flux, with the numerical range from about 0.5 to 1.3. The curve in the figure shows a gradually rising trend. Especially in the initial stage (from less than Wm), the growth of the magnetic flux is relatively significant; then the growth tends to level off. When the horizontal axis variable further increases (from Wm - 4Wm), the growth rate of the magnetic flux significantly slows down, indicating that within this interval, the influence of the horizontal axis variable on the magnetic flux weakens.

[0048] Among them, 1.2mm ≤ W m ≤ 3mm. The connected design of the open slot 250 and the outer magnetic bridge fracture can effectively guide the magnetic field path and disperse the magnetic field, thereby reducing the magnetic field harmonic content in the air gap. Controlling the minimum distance W2 of the open slot 250 ensures the effective control of the magnetic field path. A reasonable size ratio can ensure magnetic field optimization while taking into account mechanical strength and heat dissipation performance. In addition, the presence of the open slot 250 can effectively divide the large - area metal region on the surface of the rotor 200, reducing the eddy current path caused by the rotating magnetic field, thereby reducing the eddy current loss. The minimum distance W2 of the slot opening of the open slot 250 in the circumferential direction is limited between 1.2mm and 3mm, so that the motor has a more suitable magnetic load to reduce the output current, reduce the copper loss, and thus improve the efficiency of the motor; and it will not overly weaken the mechanical strength of the rotor 200.

[0049] Specifically, the minimum distance from the connection line of the lowest points in the radial direction of the magnetic steel slots 210 of two adjacent outer iron cores 220 to the open slot 250 is L2, and the maximum radius of the rotor 200 is R1, 18 ≤ R1 / L2 ≤ 25. By optimizing the relationship between R1 and L2, the magnetic leakage on the outer - circle side of the rotor 200 is reduced, improving the energy efficiency, so that it can better play its role in relatively small - sized motors; and by limiting the ratio range of L2 to R1, it is ensured that even when the outer magnetic bridge is disconnected and there is an open slot 250, the rotor 200 can still maintain sufficient mechanical strength. A reasonable value of L2 avoids the problem that the open slot 250 is too deep resulting in the outer - edge structure of the rotor 200 being too fragile; on the other hand, the design of the open slot 250 and the ratio relationship between its depth and the radius of the rotor 200 helps to reduce the local magnetic resistance and optimize the magnetic field distribution, which not only reduces the magnetic leakage phenomenon, but also improves the motor efficiency and power density. Combining the previous design improvements, including the disconnection of the outer magnetic bridge, the size optimization of the inner magnetic bridge 240, and the introduction of the open slot 250, and now adding the limitation of the ratio of the depth of the open slot 250 to the radius of the rotor 200, the motor is comprehensively optimized in terms of mechanical strength, electromagnetic performance, heat dissipation ability, and manufacturing process, and is especially suitable for high - performance and high - reliability motor applications.

[0050] Specifically, 22mm ≤ R1 ≤ 28.25mm.

[0051] According to the given range of R1 (22 mm ≤ R1 ≤ 28.25 mm) and the ratio limit (18 ≤ R1 / L2 ≤ 25), the range of the minimum depth L2 of the open slot 250 can be calculated. Specifically, when R1 = 22 mm, the range of L2 is 0.88 mm to 1.22 mm; when R1 = 28.25 mm, the range of L2 is 1.13 mm to 1.57 mm. This ensures that even when the outer magnetic bridge is disconnected, the open slot 250 will not be too deep to cause insufficient mechanical strength of the outer edge of the rotor 200. The appropriate value of L2 helps to maintain the overall structural stability of the rotor 200, especially during high-speed operation. The given range of R1 and the corresponding values of L2 provide design flexibility, allowing the specific dimensions of the open slot 250 to be adjusted according to different application scenarios to achieve optimal performance.

[0052] Specifically, the maximum diameter of the stator 100 is R2, and R2 satisfies: 0.48 ≤ (R1 - L2) / R2 ≤ 0.63. By limiting the ratio range of (R1 - L2) / R2, it can ensure the efficient utilization of the space inside the motor, which helps to maximize the size of the electromagnetic part while keeping the overall dimensions of the motor relatively small, thereby increasing the power density; and this ratio limit helps to optimize the air gap size between the stator 100 and the rotor 200, which in turn affects the electromagnetic efficiency of the motor. A reasonable air gap design can reduce the magnetic resistance, improve the motor efficiency, and reduce the energy consumption; in addition, by limiting the ratio of (R1 - L2) / R2, it ensures sufficient mechanical strength between the rotor 200 and the stator 100, avoiding the risk of deformation or damage caused by high-speed rotation.

[0053] In a specific embodiment, when W1 = 0.5 mm, W2 = 4.4 mm, L1 = 1.32 mm, W m = 1.5 mm, ts = 0.35 mm, and the rotor core stack thickness L = 40 mm, by adopting the fracture structure between the outer cores 220 of the rotor 200, while ensuring the structural strength of the rotor 200, the magnetic leakage is reduced, the magnetic flux is increased by 10%, and the efficiency is increased by 0.35%.

[0054] Specifically, the rotor 200 is further provided with a blocking portion 260, which is arranged at the outer magnetic bridge fracture of the magnetic steel groove 210 to limit the magnet 300 from detaching from the opening groove 250. Although the design of the outer magnetic bridge disconnection helps to reduce magnetic leakage and improve the motor efficiency, it may also cause the magnet 300 to loosen or fall off due to mechanical stress. By arranging the blocking portion 260 at the outer magnetic bridge fracture, the magnet 300 can be effectively prevented from detaching from the opening groove 250, ensuring its firm fixation within the magnetic steel groove 210. The blocking portion 260 not only provides an additional support point for the magnet 300 but also enhances the mechanical strength of the entire rotor 200 structure, especially maintaining stability and reliability during high-speed operation. Although the blocking portion 260 is mainly used to fix the magnet 300, its design should be considered not to obstruct the heat dissipation path. A reasonable design allows heat to still be effectively dissipated through the opening groove 250, maintaining the stability of the internal temperature of the motor. After introducing the blocking portion 260, the installation and fixation of the magnet 300 become simpler and more reliable, reducing possible problems during the assembly process, such as misalignment of the magnet 300, etc., and improving production efficiency.

[0055] Specifically, in order to make the distribution of magnetic flux density in the air gap uniform, two slits 270 are circumferentially and spacedly arranged on the outer iron core 220. The number of outer iron cores 220 is the same as the number of poles of the motor. Each outer iron core 220 is provided with two slits 270 distributed radially. The magnets 300 are radially arranged in the motor rotor 200. Two slits 270 are arranged on the outer iron core 220 between the two magnets 300. By utilizing the same polarities generated by adjacent two magnets 300, the effect of concentrating the air gap magnetic flux of the motor is enhanced. On the basis of ensuring the structural strength of the rotor 200, aiming at the problem of the increase in the harmonic content of the air gap magnetic density caused by the outer magnetic bridge port, slits 270 are arranged on each sector-shaped outer iron core 220. The slits 270 can not only further refine the magnetic field distribution but also effectively disperse and weaken the air gap magnetic density harmonics caused by the disconnection of the outer magnetic bridge. In this way, without significantly increasing the manufacturing complexity, the harmonic content of the magnetic field in the air gap can be significantly reduced, thereby reducing additional losses, lowering the vibration and noise levels, and improving the overall performance and operating stability of the motor.

[0056] Specifically, in order to improve the overall structural strength of the permanent magnet motor rotor 200, multiple rotor punching sheets are each provided with a riveting portion, and the multiple rotor punching sheets are riveted together through the riveting portion. After the rotor punching sheets are manufactured by high-speed punching technology to form an iron core with riveting buckle points, the safety of the permanent magnet motor rotor 200 during high-speed and heavy-load operation is ensured.

[0057] The present invention also provides a compressor, which includes an electric motor. The specific structure of the electric motor refers to the above embodiments. Since this compressor adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated one by one here.

[0058] The present invention also provides an air conditioning device, which includes the above electric motor. The shaft of the electric motor is connected to the pump body of the compressor, and the pump body is driven by the electric motor to perform the suction and exhaust processes of the compressor. The electric motor and the compressor can be applied to air conditioning devices, such as indoor air conditioners, central air conditioners, automotive air conditioners, etc.

[0059] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A motor, characterized in that, Comprising: A stator; A rotor, the rotor comprising a plurality of outer iron cores and an inner iron core located in the middle of the plurality of outer iron cores; The plurality of outer iron cores are evenly distributed along the circumferential direction of the inner iron core. The outer iron cores are connected to the inner iron core through inner magnetic bridges. Two or three magnetic steel grooves are provided between the outer iron cores and the inner iron core, and the outer magnetic bridges on the outer circumferential side of the rotor of the two or three magnetic steel grooves are all discontinuously arranged; A plurality of magnets arranged in the magnetic steel grooves; The rotor comprises a plurality of rotor punching sheets stacked axially. The minimum width of the inner magnetic bridge is W1, the maximum radial length of the inner magnetic bridge is L1, the thickness of the magnet is Wm, and the thickness of each rotor punching sheet is ts; Wherein, when two magnetic steel grooves are provided between the outer iron core and the inner iron core, the two magnetic steel grooves are symmetrically distributed about the d-axis passing through the outer iron core, and the angle between the magnetic steel groove and the vertical direction of the d-axis in the extending direction of the thickness Wm of the magnet is α; When three magnetic steel grooves are provided between the outer iron core and the inner iron core, the d-axis passing through the outer iron core passes through the middle magnetic steel groove, and the two magnetic steel grooves on both sides of the middle magnetic steel groove are symmetrically distributed about the d-axis. The angle between the magnetic steel grooves on both sides and the vertical direction of the d-axis in the extending direction of the thickness Wm of the magnet is α; Satisfying the relationships: ts≤W1≤Wm / 2, Wm*sinα≤L1≤10*ts.

2. The motor according to claim 1, characterized in that, A plurality of opening grooves opening outward are circumferentially arranged at intervals on the outer peripheral edge of the rotor, and the outer magnetic bridge break of the magnetic steel grooves of two adjacent outer iron cores is communicated with the opening groove; the minimum distance of the groove openings of the opening grooves in the circumferential direction is W2, where W m ≤W2≤4*W m .

3. The motor according to claim 2, characterized in that, 1.2mm ≤ W m ≤ 3mm.

4. The motor according to claim 2, wherein, The minimum distance from the connection line of the lowest points in the radial direction of the magnetic steel grooves of two adjacent outer iron cores to the opening groove is L2, the maximum radius of the rotor is R1, and 18≤R1 / L2≤25.

5. The motor according to claim 4, characterized in that, 22mm≤R1≤28.25mm.

6. The motor according to claim 4, characterized in that, The maximum diameter of the stator is R2, and R2 satisfies: 0.48≤(R1-L2) / R2≤0.

63.

7. The motor according to claim 2, wherein, The rotor is further provided with a blocking portion, and the blocking portion is arranged at the break of the outer magnetic bridge of the magnetic steel groove to limit the magnet from detaching from the opening groove.

8. The motor according to claim 1, characterized in that, Two slits are provided on the outer iron core at intervals along the circumferential direction.

9. A compressor, characterized in that, Including the motor according to any one of claims 1 to 8.

10. An air conditioning device, characterized in that, Including the motor according to any one of claims 1 to 8.

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