Motor, compressor and air conditioning equipment

Abstract

The invention discloses a motor, a compressor and air conditioning equipment, and relates to the technical field of motors, a rotor is rotatably arranged on a stator, the rotor is provided with a plurality of magnetic steel grooves along the circumferential direction, the outer magnetic bridges of the plurality of magnetic steel grooves are disconnected, 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, and the inner iron core is provided with a plurality of magnetic steel grooves. The rotor comprises a plurality of rotor punching sheets which are axially stacked; the plurality of outer iron cores are connected with the inner iron core through the inner magnetic bridge; the minimum width of the inner magnetic bridge is W1, the maximum radial length is L1, the thickness of the magnet is Wm, the thickness of each rotor punching sheet is ts, the angle between the width of the magnetic steel groove in the circumferential direction and the q axis of the rotor is alpha, and the relations that Wm / 2 > = W1 > = ts, and 10 * ts > = L1 > = Wm * sin alpha are met. By controlling the size of the inner magnetic bridge, on the basis of ensuring the structural strength of the rotor, the inner magnetic bridge can maintain the structural stability, and the influence on a magnetic flux path can be reduced as much as possible.

Description

Technical Field

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

[0002] The rotor of the motor is provided with a magnetic steel slot for installing magnets. To ensure the structural strength of the rotor, the magnetic steel slot is usually provided with an external magnetic bridge. The external magnetic bridge here refers to the part extending from the magnetic steel slot where the magnet is placed to the outer edge of the rotor (the external magnetic bridge is a small section of material connecting the magnetic steel slot where the magnet is placed and the rest of the rotor). However, its external magnetic bridge structure will cause magnet leakage, resulting in a decrease in motor performance. The degree of magnetic leakage is related to the size and number of external magnetic bridges. In order to reduce eddy current losses, optimize magnetic field distribution, and improve heat dissipation performance, sometimes a design of disconnecting the external magnetic bridge is chosen. If all the external magnetic bridges on the outer circumference of the rotor are interrupted, the motor magnet leakage can be suppressed, but it also brings problems with the strength of the rotor. Therefore, it is crucial to balance the suppression of magnet leakage and the guarantee of rotor strength. Summary of the invention

[0003] The main purpose of the present invention is to provide a motor, a compressor and an air conditioning device, which is designed to control the size of the inner magnetic bridge (width W 1 and length L 1 ), on the basis of ensuring the strength of the rotor structure, the internal magnetic bridge can maintain structural stability and minimize the impact on the magnetic flux path.

[0004] To achieve the above-mentioned object, the present invention provides a motor, comprising: a stator, a rotor and a plurality of magnets arranged in the magnetic steel slots; the rotor is rotatably arranged on the stator, the rotor is provided with a plurality of magnetic steel slots along the circumferential direction, the outer magnetic bridges of the plurality of magnetic steel slots are all disconnected, the plurality of magnetic steel 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 comprises a plurality of rotor punchings stacked axially; Among them, the plurality of outer cores are connected to the inner core through an inner magnetic bridge; the minimum width of the inner magnetic bridge is W 1 , the maximum radial length is L 1 The thickness of the magnet is Wm, and the thickness of each rotor punch is t s , the angle between the circumferential width of the magnetic steel slot and the rotor q axis is α, satisfying the relationship: t s ≤W 1 ≤W m / 2,W m *sinα≤L 1 ≤10*t s .

[0005] In one embodiment, the outer periphery of the rotor is provided with a plurality of open slots opening outward at intervals along the circumferential direction, and the outer magnetic bridge fractures of the magnetic steel slots of two adjacent outer cores are connected to the open slots; the minimum distance between the slots of the open slots in the circumferential direction is W 2 , where W m ≤W 2 ≤4*W m .

[0006] In one embodiment, 1.2 mm ≤ W m ≤3mm.

[0007] In one embodiment, the minimum distance between the radially lowest points of the magnetic steel slots of two adjacent outer cores and the opening slot is L 2 , the maximum radius of the rotor is R 1 , 18≤R 1 / L 2 ≤25.

[0008] In one embodiment, 22 mm ≤ R 1 ≤28.25mm.

[0009] In one embodiment, the maximum diameter of the stator is R 2 , R 2 Satisfy: 0.48≤(R 1 -L 2 ) / R 2 ≤0.63.

[0010] In one embodiment, the rotor is further provided with a blocking portion, and the blocking portion is provided at the outer magnetic bridge break of the magnetic steel slot to limit the magnet from escaping from the open slot.

[0011] In one embodiment, two slits are provided on the outer core at intervals along the circumferential direction.

[0012] In one embodiment, the plurality of rotor punchings are each provided with a riveting portion, and the plurality of rotor punchings are riveted to each other via the riveting portion.

[0013] The present invention also provides a compressor, comprising the motor as described above.

[0014] The present invention also provides an air conditioning device, comprising the motor or the compressor as described above.

[0015] The technical solution of the present invention is to control the size of the inner magnetic bridge (width W 1 and length L 1), can effectively reduce the leakage magnetic phenomenon, thereby improving the efficiency of the motor. When the outer magnetic bridge is completely disconnected, a reasonable design of the inner magnetic bridge can significantly reduce the negative impact caused by this; it helps to improve the magnetic field distribution, making the magnetic field more uniform, which is beneficial to improving the overall performance of the motor, including efficiency, power density, etc.; in this way, on the basis of ensuring the strength of the rotor structure, the traditional outer iron core connection structure layout is improved to ensure that the inner magnetic bridge can maintain structural stability and minimize the impact on the magnetic flux path. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of an embodiment of a motor provided by the present invention; Figure 2 is a schematic structural diagram of a rotor embodiment; Figure 3 is a schematic structural diagram of another embodiment of a rotor; Figure 4 is a schematic structural diagram of another embodiment of a rotor; Figure 5 is the overall deformation of the rotor and the width of the internal magnetic bridge W 1 Relationship diagram between them; Figure 6 is the magnetic flux and the slot opening W 2 Relationship diagram between them.

[0018] Description of Figure Numbers: 100. stator; 200, rotor; 210, magnetic steel slot; 220, outer iron core; 230, inner iron core; 240, inner magnetic bridge; 250, opening slot; 260, blocking portion; 270, slit; 300. Magnet.

[0019] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] The rotor of the motor is provided with a magnetic steel slot for installing magnets. To ensure the structural strength of the rotor, the magnetic steel slot is usually provided with an external magnetic bridge. The external magnetic bridge here refers to the part extending from the magnetic steel slot where the magnet is placed to the outer edge of the rotor (the external magnetic bridge is a small section of material connecting the magnetic steel slot where the magnet is placed and the outer edge of the rotor). However, its external magnetic bridge structure will cause magnet leakage, resulting in a decrease in motor performance. The degree of magnetic leakage is related to the size and number of external magnetic bridges. In order to reduce eddy current losses, optimize magnetic field distribution, and improve heat dissipation performance, sometimes a design of disconnecting the external magnetic bridge is chosen. If all the external magnetic bridges on the outer circumference 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 magnet leakage and the guarantee of rotor strength.

[0024] The present invention provides a motor which improves the traditional outer core connection structure arrangement on the basis of ensuring the rotor structural strength, limits the magnetic leakage of the magnet by reducing the number of external magnetic bridges on the outer circle side of the rotor, and improves the utilization rate of the magnet.

[0025] See also Figures 1 to 6In one embodiment of the present invention, the motor includes a stator 100 , a rotor 200 , and a plurality of magnets 300 disposed in magnetic steel slots 210 of the rotor 200 .

[0026] The stator 100 part includes a base, a stator core and a stator winding. The 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 power is applied. It is usually wound by insulated wires and placed in the slots of the stator core. The rotor 200 part includes a rotating shaft, a rotor core and a magnet. 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 magnet 300 is placed in the magnetic steel slot 210 of the rotor core, and an electromagnetic torque will be generated when power is applied.

[0027] Reference Figure 1 The rotor 200 is rotatably disposed in the stator 100 (inside the stator core), and the rotor 200 is provided with a plurality of magnetic steel slots 210 along the circumferential direction. The outer magnetic bridges of the plurality of magnetic steel slots 210 (i.e., the openings of the magnetic steel slots 210 on the outer edge side of the rotor 200) are all disconnected. The plurality of magnetic steel slots 210 define a plurality of outer cores 220 and an inner core 230 located between the plurality of outer cores 220 in the circumferential direction of the rotor 200, and the rotor 200 includes a plurality of rotor punchings stacked axially.

[0028] Reference Figures 1 to 4 , multiple magnets 300 are arranged in the magnetic steel slot 210, wherein the multiple outer iron cores 220 are connected to the inner iron core 230 through the inner magnetic bridge 240; by arranging the inner magnetic bridge 240 between the multiple outer iron cores 220 and the inner iron core 230, the problem of decreased mechanical strength due to the disconnection of the external magnetic bridge can be compensated to a certain extent, allowing the rotor 200 to maintain a high mechanical strength while reducing the leakage magnetic phenomenon caused by the external magnetic bridge.

[0029] The minimum width of the inner magnetic bridge 240 (the width is the straight line distance between two points on the circumference) is W. 1 , the maximum radial length is L 1 , the thickness of the magnet 300 is W m (like Figure 1 As shown in , multiple sections can be measured and the average value can be taken), the thickness of each rotor punching is t s (thickness in the stacking direction, which can be measured in multiple sections and averaged), the angle between the circumferential width of the magnetic steel slot 210 and the q-axis of the rotor 200 is α (such as Figure 1 As shown, the d-axis direction is the direction of the magnetic field, that is, the direction of the magnetic pole axis, and 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≥W 1 ≥ts , 10*t s ≥L 1 ≥W m *sinα, the parameter limitation ensures that the inner magnetic bridge 240 can provide sufficient mechanical support without excessively interfering with the magnetic field distribution. 1 (minimum circumferential width of inner magnetic bridge 240) and t s The relationship between (the thickness of each rotor punching sheet) ensures that the inner magnetic bridge 240 can maintain structural stability while minimizing the impact on the magnetic flux path.

[0030] Reference Figure 5 , Figure 5 The overall deformation of the rotor 200 and the width W of the inner magnetic bridge 240 1 Relationship diagram between 1 (the minimum circumferential width of the inner magnetic bridge 240), the vertical axis is the overall deformation of the rotor 200. It can be seen from the figure that with the increase of the horizontal axis variable, the overall deformation of the rotor 200 shows a trend of first rapidly decreasing and then tending to be gentle.

[0031] When W 1 Less than t s、 When the rotor 200 is deformed, the overall deformation amount is between 30 μm and 80 μm.

[0032] With W 1 Greater than t s , the overall deformation of the rotor 200 is approximately between 20 μm and 30 μm.

[0033] This shows that in the initial stage, the horizontal axis variable has a greater influence on the overall deformation of the rotor 200, and this influence gradually weakens as the variable increases. 1 In t s ≤W 1 ≤W m / 2, the overall deformation of the rotor 200 is optimally controlled.

[0034] The improved solution significantly reduces magnetic leakage, improves motor efficiency and electromagnetic performance, and ensures sufficient mechanical strength of the rotor 200 by disconnecting the outer magnetic bridge and introducing a specially designed inner magnetic bridge 240. At the same time, the design of multiple rotor punchings based on axial stacking is not only easy to manufacture, but also optimizes cost-effectiveness, and overall achieves a comprehensive improvement in motor performance, reliability and economy.

[0035] The technical solution of the present invention is to control the size of the inner magnetic bridge 240 (width W 1 and length L 1), can effectively reduce the leakage magnetic field phenomenon, thereby improving the efficiency of the motor. When the outer magnetic bridge is completely disconnected, the reasonable design of the inner magnetic bridge 240 can significantly reduce the negative impact caused by this; it helps to improve the magnetic field distribution, making the magnetic field more uniform, which is beneficial to improving the overall performance of the motor, including efficiency, power density, etc.; in this way, 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 impact on the magnetic flux path.

[0036] Furthermore, the outer periphery of the rotor 200 is provided with a plurality of open slots 250 opening outward at intervals along the circumferential direction, and the outer magnetic bridge fractures of the magnetic steel slots 210 of two adjacent outer cores 220 are connected to the open slots 250; the minimum distance between the slots of the open slots 250 in the circumferential direction is W 2 , W m ≤W 2 ≤4*W m .

[0037] Reference Figure 6 , Figure 6 is the magnetic flux and the W of the open slot 250 2 The horizontal axis represents the minimum distance of the opening slot 250 is W. 2 The vertical axis represents the magnetic flux, and the value range is from 0.5 to 1.3. The curve in the figure shows a gradual upward trend, especially in the initial stage (from less than Wm), the growth of magnetic flux is more significant; then the growth tends to be flat. When the horizontal axis variable increases further (from Wm-4Wm), the growth rate of magnetic flux slows down significantly, indicating that in this range, the influence of the horizontal axis variable on magnetic flux weakens.

[0038] Among them, 1.2mm≤W m ≤3mm. The connection design between the opening slot 250 and the external magnetic bridge break can effectively guide the magnetic field path and disperse the magnetic field, thereby reducing the magnetic field harmonic content in the air gap. Control the minimum distance W of the opening slot 250 2 , ensuring effective control of the magnetic field path, and reasonable size ratio can ensure the optimization of the magnetic field while taking into account mechanical strength and heat dissipation performance. In addition, the existence of the open slot 250 can effectively divide the large metal area on the surface of the rotor 200, reducing the eddy current path caused by the rotating magnetic field, thereby reducing eddy current losses. The minimum distance W of the slot of the open slot 250 in the circumferential direction is 2 It is limited to between 1.2 mm and 3 mm, so that the motor has a more suitable magnetic load to reduce the output current, reduce copper loss, and thus improve the efficiency of the motor; and the mechanical strength of the rotor 200 will not be excessively weakened.

[0039] Specifically, the minimum distance between the radially lowest point of the magnetic steel slots 210 of two adjacent outer cores 220 and the opening slot 250 is L. 2 , the maximum radius of the rotor 200 is R 1 , 18≤R 1 / L 2 ≤25. By optimizing the design R 1 and L 2 The relationship between L and L reduces the magnetic leakage on the outer side of the rotor 200, improves energy efficiency, and can better play its effect in a relatively small-sized motor; and by limiting L 2 With R 1 The ratio range ensures that the rotor 200 can maintain sufficient mechanical strength even when the external magnetic bridge is disconnected and there is an open slot 250. 2 The value avoids the problem that the outer edge structure of the rotor 200 is too fragile due to the excessive depth of the opening slot 250; on the other hand, the design of the opening slot 250 and the proportional relationship between its depth and the radius of the rotor 200 help to reduce local magnetic resistance and optimize the magnetic field distribution, which not only reduces magnetic leakage, but also improves the motor efficiency and power density. Combined with the previous design improvements, including the disconnection of the outer magnetic bridge, the optimization of the size of the inner magnetic bridge 240 and the introduction of the opening slot 250, and now with the limitation of the ratio of the depth of the opening slot 250 to the radius of the rotor 200, the motor has been fully optimized in terms of mechanical strength, electromagnetic performance, heat dissipation capacity and manufacturing process, and is particularly suitable for high-performance and high-reliability motor applications.

[0040] Specifically, 22mm≤R 1 ≤28.25mm.

[0041] According to the given R 1 Range (22mm≤R 1 ≤28.25mm) and ratio limit (18≤R 1 / L 2 ≤25), the minimum depth L of the opening groove 250 can be calculated 2 Specifically, when R 1 =22mm, the range of L2 is 0.88mm to 1.22mm; when R 1 =28.25mm, L 2 The range of L is 1.13 mm to 1.57 mm. This ensures that even when the outer magnetic bridge is disconnected, the opening slot 250 will not be too deep to cause insufficient mechanical strength of the outer edge of the rotor 200. 2 The value helps maintain the overall structural stability of the rotor 200, especially when running at high speeds. 1 Range and corresponding L 2The value provides design flexibility, and the specific size of the opening slot 250 can be adjusted according to different application scenarios to achieve optimal performance.

[0042] Specifically, the maximum diameter of the stator 100 is R 2 , R 2 Satisfy: 0.48≤(R 1 -L 2 ) / R 2 ≤0.63. By limiting (R 1 -L 2 ) / R 2 The ratio range can ensure that the space inside the motor is efficiently utilized, which helps to maximize the size of the electromagnetic part while keeping the motor size relatively small, thereby improving the power density; and this ratio limit helps to optimize the air gap size between the stator 100 and the rotor 200, thereby affecting the electromagnetic efficiency of the motor, and a reasonable air gap design can reduce magnetic resistance, improve motor efficiency, and reduce energy consumption. In addition, by limiting (R 1 -L 2 ) / R 2 The ratio ensures that there is sufficient mechanical strength between the rotor 200 and the stator 100 to avoid the risk of deformation or damage caused by high-speed rotation.

[0043] In one embodiment, when W 1 =0.5mm, W 2 =4.4mm, L 1 =1.32mm, W m =1.5mm, ts=0.35mm, and rotor core stack thickness L=40mm, by adopting the fracture structure between the outer core 220 of the rotor 200, the leakage magnetic flux is reduced while ensuring the structural strength of the rotor 200, the magnetic flux is increased by 10%, and the efficiency is increased by 0.35%.

[0044] Specifically, the rotor 200 is also provided with a blocking portion 260, which is provided at the outer magnetic bridge break of the magnetic steel slot 210 to limit the magnet 300 from detaching from the open slot 250. Although the design of disconnecting the outer magnetic bridge helps to reduce magnetic leakage and improve motor efficiency, it may also cause the magnet 300 to loosen or fall off due to mechanical stress. By providing the blocking portion 260 at the outer magnetic bridge break, the magnet 300 can be effectively prevented from detaching from the open slot 250, ensuring that it is firmly fixed in the magnetic steel slot 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 when running at high speeds, it can maintain stability and reliability; although the blocking portion 260 is mainly used to fix the magnet 300, its design should take into account not to hinder the heat dissipation path. Reasonable design allows heat to be effectively dissipated through the open slot 250 to maintain the stability of the internal temperature of the motor. After the blocking portion 260 is introduced, the installation and fixation of the magnet 300 becomes simpler and more reliable, which reduces the problems that may occur during the assembly process, such as the misalignment of the magnet 300, and improves the production efficiency.

[0045] Specifically, in order to make the magnetic flux density in the air gap evenly distributed, two slits 270 are provided on the outer iron core 220 at intervals along the circumferential direction. The number of the 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 in the radial direction. The magnets 300 are radially arranged in the motor rotor 200. Two slits 270 are provided on the outer iron core 220 between the two magnets 300. The two adjacent magnets 300 produce the same polarity to enhance the air gap magnetic flux gathering effect of the motor. On the basis of ensuring the structural strength of the rotor 200, in order to address the problem of increased harmonic content of the air gap magnetic density caused by the external magnetic bridge port, a slit 270 is provided on each fan-shaped outer iron core 220. The slit 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 external magnetic bridge. In this way, the magnetic field harmonic content in the air gap can be significantly reduced without significantly increasing the manufacturing complexity, thereby reducing additional losses, reducing vibration and noise levels, and improving the overall performance and operation stability of the motor.

[0046] Specifically, in order to improve the overall structural strength of the permanent magnet motor rotor 200, multiple rotor punchings are provided with riveted parts, and multiple rotor punchings are riveted together through the riveted parts. The rotor punchings are manufactured through a high-punching process to form an iron core with riveted points to ensure the safety of the permanent magnet motor rotor 200 during high-speed and heavy-load operation.

[0047] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since the compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0048] The present invention also provides an air conditioning device, comprising the above motor, wherein the shaft of the motor is connected to the pump body of the compressor, and the pump body is driven by the motor to perform the suction and exhaust process of the compressor. The motor and the compressor can be used in air conditioning devices, such as indoor air conditioners, central air conditioners, and automobile air conditioners.

[0049] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A motor, characterized in that: include: stator; A rotor rotatably disposed on the stator, wherein the rotor is provided with a plurality of magnetic steel slots along the circumferential direction, wherein the outer magnetic bridges of the plurality of magnetic steel slots are all disconnected, wherein the plurality of magnetic steel slots define a plurality of outer iron cores and an inner iron core located between the plurality of outer iron cores in the circumferential direction of the rotor, and wherein the rotor comprises a plurality of rotor punchings stacked axially; A plurality of magnets disposed in the magnetic steel slots; The outer cores are connected to the inner core via an inner magnetic bridge; the inner magnetic bridge has a minimum width of W1, a maximum radial length of L1, and a thickness of W. m The thickness of each rotor punching is t s , the angle between the circumferential width of the magnetic steel slot and the rotor q axis is α, satisfying the relationship: t s ≤W1≤W m / 2,W m *sinα≤L1≤10*t s .

2. The motor according to claim 1, characterized in that The outer periphery of the rotor is provided with a plurality of open slots opening outward at intervals along the circumferential direction, and the outer magnetic bridge fractures of the magnetic steel slots of two adjacent outer iron cores are connected to the open slots; the minimum distance between the slots of the open slots in the circumferential direction is W2, wherein 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, characterized in that The minimum distance from the line connecting the lowest points of the magnetic steel slots of two adjacent outer cores in the radial direction to the open slot 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, characterized in that The rotor is also provided with a blocking portion, which is arranged at the outer magnetic bridge break of the magnetic steel slot to limit the magnet from escaping from the open slot.

8. The motor according to claim 1, characterized in that The outer core is provided with two slits spaced apart in the circumferential direction.

9. A compressor, characterized in that: Comprising the electric machine as claimed in any one of claims 1 to 8.

10. An air conditioning device, characterized in that: Comprising the electric machine as claimed in any one of claims 1 to 8.

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