Rotor core, motor, compressor and air conditioning equipment

Abstract

The utility model discloses a rotor core, motor, compressor and air conditioning equipment, relates to the technical field of motor, the rotor core comprises a plurality of first punching sheets and a plurality of second punching sheets, the first punching sheets are provided with a plurality of first magnet grooves along the circumferential direction, the first magnet grooves are provided with first outer magnetic bridges close to the outer edges of the first punching sheets, and the second punching sheets are provided with second outer magnetic bridges close to the outer edges of the second punching sheets. The first outer magnetic bridge is disconnected; the plurality of first magnet 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 first punching sheet; the plurality of outer iron cores are connected with the inner iron core; a plurality of second magnet grooves are formed in the second punching sheets along the circumferential direction, the second magnet grooves are provided with second outer magnetic bridges, and the plurality of first punching sheets and the plurality of second punching sheets are laminated along the axial direction to form a rotor iron core; wherein the total thickness of the plurality of first punching sheets is L1, the total thickness of the plurality of second punching sheets is L2, and the relationship that 0.3 L1 is greater than or equal to L2 is satisfied. The technical scheme provided by the utility model aims to optimize the magnetic field distribution of the rotor iron core and maintain enough mechanical strength at the same time.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a rotor core, motor, compressor and air conditioning equipment. Background Technology

[0002] The rotor core has multiple magnetic slots arranged circumferentially. Generally, there is an outer magnetic bridge near the outer edge of the rotor's outer circle of the magnetic slots. The outer magnetic bridge can prevent the permanent magnets from flying out during the rotation of the motor. However, from the perspective of magnetic field distribution, the magnetic field distribution around the outer magnetic bridge is uneven. Breaking the magnetic bridge helps to optimize the distribution of the magnetic field in the entire rotor area, making the magnetic field distribution more reasonable, thereby improving the overall performance of the motor. However, after breaking the outer magnetic bridge, it is necessary to solve the problem of the structural strength of the rotor core to avoid rotor deformation under the action of centrifugal force. At the same time, it is also necessary to take into account the need to make the magnetic field distribution more reasonable after breaking the outer magnetic bridge, thereby improving the overall performance of the motor. Utility Model Content

[0003] The main purpose of this invention is to provide a rotor core, motor, compressor, and air conditioning equipment, which aims to ensure the structural strength of the rotor core after the external magnetic bridge is disconnected.

[0004] To achieve the above objectives, the rotor core proposed in this utility model comprises:

[0005] A plurality of first laminations are provided, each first lamination having a plurality of first magnet slots arranged circumferentially. Each first magnet slot has a first outer magnetic bridge near its outer edge, and the first outer magnetic bridge is disconnected. The plurality of first magnet slots define a plurality of outer iron cores and an inner iron core located between the outer iron cores circumferentially. Each of the outer iron cores is connected to the inner iron core.

[0006] Multiple second laminations are provided with multiple second magnet slots along the circumferential direction. The second magnet slots have second external magnetic bridges. Multiple first laminations and multiple second laminations are stacked axially to form a rotor core. The total thickness of the multiple first laminations is L1, and the total thickness of the multiple second laminations is L2, satisfying the relationship: 0.3L1≥L2.

[0007] In one embodiment, the outer periphery of the first lamination is provided with a plurality of opening slots, and the two first magnet slots of two adjacent outer iron cores are connected through the opening slots; the minimum distance between the slot opening lengths is K, and the outer diameter of the first lamination is D, then K and D satisfy the relationship: 0.04≤K / D≤0.25.

[0008] In one embodiment, the first lamination is further provided with a blocking portion, which is located at the break of the first outer magnetic bridge of the first magnet slot to prevent the magnet installed in the first magnet slot from detaching from the opening slot.

[0009] In one embodiment, the outer iron core and the inner iron core are connected by a first inner magnetic bridge, the minimum width of the first inner magnetic bridge being W1, where 0.3mm≤W1≤1mm.

[0010] In one embodiment, the outer iron core is formed by two first magnet slots arranged in a V-shape; or, the outer iron core is formed by three first magnet slots arranged in a U-shape.

[0011] In one embodiment, the arrangement of the plurality of second magnet slots on the second lamination is the same as the arrangement of the plurality of first magnet slots on the first lamination.

[0012] In one embodiment, a plurality of second magnet slots define a plurality of sector portions and an iron core portion located in the middle of the plurality of sector portions in the circumferential direction of the second lamination. The sector portions are connected to the iron core portion through a second external magnetic bridge, and a second magnet slot between a sector portion and the iron core portion is connected by a connecting slot.

[0013] In one embodiment, the thickness of the second outer magnetic bridge is W2, where 0.3mm ≤ W2 ≤ 1mm.

[0014] In one embodiment, both the first and second punches are provided with riveting portions, and multiple first punches and multiple second punches are riveted together through the riveting portions.

[0015] This utility model also proposes an electric motor, including the rotor core of any of the above-mentioned solutions.

[0016] This utility model also proposes a compressor, which includes the motor described above.

[0017] This utility model also proposes an air conditioning device, including the compressor described above.

[0018] This invention addresses the impact of the presence and interruption of the external magnetic bridge on magnetic field distribution and structural strength, aiming to optimize the magnetic field distribution of the rotor core while maintaining sufficient mechanical strength. Traditional external magnetic bridge designs result in uneven magnetic field distribution around the bridge, affecting the utilization rate of permanent magnets and potentially limiting motor performance. By setting an interrupted external magnetic bridge on the first lamination, the magnetic field distribution throughout the rotor region can be effectively improved, making it more rational and thus enhancing the overall motor performance. Completely interrupting the external magnetic bridge may lead to a decrease in the structural strength of the rotor core, making it prone to deformation or damage during high-speed rotation. The rotor core is constructed by stacking the first and second laminations, with the magnetic bridge on the second lamination remaining intact to provide necessary mechanical support, while the first lamination optimizes the magnetic field distribution. The outer and inner cores remain connected. This combination ensures both structural strength and optimized magnetic field distribution. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of an embodiment of the rotor core provided by this utility model;

[0021] Figure 2 A schematic diagram of another embodiment of the rotor core provided by this utility model;

[0022] Figure 3 A schematic diagram of the structure of an embodiment of the first lamination provided by this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of an embodiment of the second lamination provided by this utility model;

[0024] Figure 5 A schematic diagram of another embodiment of the first lamination provided by this utility model;

[0025] Figure 6 This is a schematic diagram of another embodiment of the second lamination provided by this utility model;

[0026] Figure 7 The graph shows the relationship between compressor motor energy efficiency and 0.3L1≥L2>0.

[0027] Figure 8 The graph shows the relationship between the magnetic energy attenuation of the motor and 0.04≤K / D≤0.25.

[0028] Explanation of icon numbers:

[0029] 100. Rotor core;

[0030] 110. First lamination; 111. First magnet slot; 112. Outer iron core; 113. Inner iron core; 114. Opening slot; 115. Blocking part; 116. First inner magnetic bridge;

[0031] 120. Second lamination; 121. Second magnet slot; 122. Connecting slot; 123. Sector-shaped part; 124. Iron core part; 125. Second outer magnetic bridge;

[0032] 200. Magnet.

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] The rotor core has multiple magnetic slots arranged circumferentially. Generally, there is an outer magnetic bridge near the outer edge of the rotor's outer circle of the magnetic slots. The outer magnetic bridge can prevent the permanent magnets from flying out during the rotation of the motor. However, from the perspective of magnetic field distribution, the magnetic field distribution around the outer magnetic bridge is uneven. Breaking the magnetic bridge helps to optimize the distribution of the magnetic field in the entire rotor area, making the magnetic field distribution more reasonable, thereby improving the overall performance of the motor. However, after breaking the outer magnetic bridge, it is necessary to solve the problem of the structural strength of the rotor core to avoid rotor deformation under the action of centrifugal force. At the same time, it is also necessary to take into account the need to make the magnetic field distribution more reasonable after breaking the outer magnetic bridge, thereby improving the overall performance of the motor.

[0038] Therefore, this utility model proposes a rotor core.

[0039] This solution needs to address the issue of ensuring the structural strength of the rotor core after the magnetic bridge is broken; it also needs to address the issue that, while ensuring structural strength, breaking such a magnetic bridge can result in a more reasonable magnetic field distribution without creating additional magnetic resistance, thus limiting the improvement in motor performance and reducing its value.

[0040] Please see Figures 1 to 6 In one embodiment of this utility model, the rotor core 100 includes a plurality of first laminations 110 and a plurality of second laminations 120. A plurality of first magnet slots 111 are provided on the first laminations 110 along the circumferential direction, and the first outer magnetic bridges of the plurality of first magnet slots 111 are all disconnected. The plurality of first magnet slots 111 define a plurality of outer cores 112 and an inner core 113 located in the middle of the plurality of outer cores 112 in the circumferential direction of the first laminations 110. The plurality of outer cores 112 are all connected to the inner core 113. A plurality of second magnet slots 121 are provided on the second laminations 120 along the circumferential direction, and the second magnet slots 121 have second outer magnetic bridges 125. The plurality of first laminations 110 and the plurality of second laminations 120 are stacked axially to form the rotor core 100. The total thickness of the plurality of first laminations 110 is L1, and the total thickness of the plurality of second laminations 120 is L2, satisfying the relationship: 0.3L1≥L2.

[0041] By designing each outer iron core 112 to remain connected to the central inner iron core 113, the integrity of the structure is maintained while ensuring magnetic field optimization. This reduces the impact on the uniform distribution of the magnetic field and enhances the overall mechanical strength of the structure. A first inner magnetic bridge 116 is formed between the outer iron core 112 and the inner iron core 113. Although the outer iron core 112 and the inner iron core 113 are connected, this connection via the first inner magnetic bridge 116 is much smaller than a complete first outer magnetic bridge, thus having a relatively smaller impact on the magnetic field distribution. This largely preserves the magnetic field optimization effect caused by a broken magnetic bridge, while avoiding other problems that might arise from the detachment of the outer iron core 112. In this way, the mechanical strength of the rotor is enhanced without sacrificing magnetic field optimization, achieving a good balance between the two.

[0042] In addition, after the first outer magnetic bridge is broken, it is necessary to solve the structural strength problem of the rotor core 100 and avoid rotor deformation under centrifugal force. The rotor core 100 is formed by stacking multiple second laminations 120 (with the magnetic bridge intact) and multiple first laminations 110 (with the magnetic bridge broken) along the axial direction. The second laminations 120 are used to maintain the structural strength and optimize the magnetic field distribution.

[0043] Reference Figure 1 In one embodiment, a plurality of first laminations 110 and a plurality of second laminations 120 are stacked alternately, that is, each first lamination 110 with a complete magnetic bridge is followed by a second lamination 120 with a broken magnetic bridge, and so on, until the desired core thickness is achieved.

[0044] Reference Figure 2 In one embodiment, multiple first stampings 110 are stacked and located in the middle, and multiple second stampings 120 are stacked and divided into two groups, respectively located at both ends of the multiple first stampings 110; or multiple second stampings 120 are stacked and divided into three groups, multiple first stampings 110 are stacked and divided into two groups, and the three groups of second stampings 120 together clamp the two groups of first stampings 110.

[0045] Typically, the assembly of the motor rotor core 100 can be achieved through various methods, including but not limited to: riveting: using small metal parts (such as rivets) to fix the laminations together; bonding: using special adhesives to fix the layers of laminations; self-locking design: utilizing special designs on the laminations (such as hooks or grooves) to allow the laminations to lock together without the need for additional fasteners.

[0046] Since the first outer magnetic bridge being broken affects the structural strength of the rotor core 100, while the second outer magnetic bridge 125 of the second lamination 120 is intact, the second lamination 120 plays an important structural support role when multiple first laminations 110 and multiple second laminations 120 are stacked axially to form the rotor core 100. The total thickness L1 of multiple first laminations 110 and the total thickness L2 of multiple second laminations 120 are specified to satisfy 0.3L1≥L2. This means that the first lamination 110 (the lamination with the broken magnetic bridge) accounts for a larger proportion in thickness. Since the first outer magnetic bridge of the first lamination 110 is broken, it helps to optimize the distribution of the magnetic field in the entire rotor region. A larger L1 means that more elements that can optimize the magnetic field distribution are used in the rotor core 100 to participate in shaping the magnetic field distribution. This can better improve the originally uneven magnetic field distribution around the first outer magnetic bridge, thereby improving the overall performance of the motor, such as increasing the torque density of the motor and reducing torque pulsation and other magnetic field-related performance indicators.

[0047] Although the total thickness L2 of the second lamination 120 is relatively small, the second outer magnetic bridge 125 of the second lamination 120 is intact, which plays a certain role in maintaining the structural strength of the rotor core 100. That is, while pursuing a better magnetic field distribution, a certain structural strength guarantee is still maintained.

[0048] The technical solution of this utility model mainly addresses the impact of the presence and interruption of the external magnetic bridge on the magnetic field distribution and structural strength, aiming to optimize the magnetic field distribution of the rotor core 100 while maintaining sufficient mechanical strength. Traditional external magnetic bridge designs result in uneven magnetic field distribution around the bridge, affecting the utilization rate of permanent magnets and potentially limiting motor performance. By setting an interrupted external magnetic bridge on the first lamination 110, the magnetic field distribution throughout the rotor region can be effectively improved, making it more rational and thus enhancing the overall performance of the motor. Completely interrupting the external magnetic bridge may lead to a decrease in the structural strength of the rotor core 100, making it prone to deformation or damage during high-speed rotation. The rotor core 100 is constructed by stacking the first lamination 110 and the second lamination 120, where the magnetic bridge on the second lamination 120 is not interrupted, providing necessary mechanical support, while the first lamination 110 is used to optimize the magnetic field distribution. Furthermore, the outer core 112 and the inner core 113 remain connected. This combination ensures both structural strength and optimizes the magnetic field distribution.

[0049] Reference Figures 3 to 6 Furthermore, the outer periphery of the first punch 110 is provided with a plurality of opening slots 114 facing outward, and the opening slots 114 connect the two first magnet slots 111 of two adjacent outer iron cores 112; the minimum distance of the slot length of the opening slot 114 is K, and the outer diameter of the first punch 110 is D, then K and D satisfy the relationship: 0.04≤K / D≤0.25.

[0050] The size of the slot 114 determines the degree of suppression of the armature magnetic field. If it's too large, it reduces the amount of magnet 200 used, thus increasing winding losses. If it's too small, it will lead to magnetic flux leakage and will not effectively suppress the armature magnetic field, ultimately resulting in suboptimal energy efficiency. When 0.04 ≤ K / D ≤ 0.25, the slot length K has a certain proportional range relative to the outer diameter D. Within this range, the size of the slot 114 is moderate. Within the range of 0.04 ≤ K / D ≤ 0.25, a smaller K / D value means that the slot 114 weakens the outer periphery of the first lamination 110 relatively less; since the slot 114 opens outwards, the degree of weakening of the outer periphery directly affects the structural strength of the first lamination 110. Even with a relatively large K / D value (0.25), based on the condition 0.3L1≥L2, because there are sufficient second laminations 120 to optimize the magnetic field, although the structural strength of the first lamination 110 is weakened to some extent, the overall performance of the rotor core 100 will not be significantly affected by the slight reduction in the structural strength of the first lamination 110. When 0.3L1≥L2 focuses on optimizing the magnetic field using the second lamination 120 while also considering structural strength, 0.04≤K / D≤0.25 further optimizes the magnetic field distribution from the angle of the opening slot 114 of the first lamination 110 without seriously affecting the structural strength. The two work together to achieve an overall performance improvement.

[0051] In the rotor core 100 of the motor, a magnet 200 is installed in the first magnet slot 111, and the opening slot 114 connects the two first magnet slots 111 of the two adjacent outer cores 112. Since the motor is subjected to various forces such as vibration and centrifugal force during operation, there is a risk that the magnet 200 may detach from the opening slot 114 of the first magnet slot 111.

[0052] For this purpose, the first lamination 110 is also provided with a blocking part 115, which is located at the first external magnetic bridge break of the first magnet slot 111 to prevent the magnet 200 installed in the first magnet slot 111 from detaching from the opening slot 114; the outer iron core 112 has first magnet slots 111 on both sides, and the first external magnetic bridge break of the two first magnet slots 111 of two adjacent outer iron cores 112 is connected to the opening slot 114. The blocking part 115 is formed by the two ends of the protrusion located in the two first magnet slots 111 to prevent the magnet 200 from detaching from the opening slot 114 due to various external forces.

[0053] The protrusion is located between the two first magnet slots 111 and extends partially to the opening of the two first magnet slots 111. It does not affect the basic distribution of the magnetic field in the slot (because it occupies a relatively small and reasonable space) and can limit the magnet 200 by using the boundary of the first magnet slot 111. It does not require a large-scale modification to the entire rotor core 100 structure. Instead, by adding a simple blocking part 115 to the original first magnet slot 111 and opening slot 114 structure, the problem of the magnet 200 possibly detaching is solved, and the reliability and stability of the entire rotor core 100 structure are improved.

[0054] Under the conditions of the thickness relationship of the first lamination 110 and the second lamination 120 (0.3L1≥L2) and the relationship between the groove length and outer diameter of the opening groove 114 (0.04≤K / D≤0.25) mentioned above, the setting of the blocking part 115 further improves the overall structure. It is a supplement to the local structure on the basis of ensuring the optimization of magnetic field distribution (through the reasonable design of the first lamination 110 and the second lamination 120) and structural strength (considering the influence of the opening groove 114 on the structure, etc.).

[0055] The outer core 112 and the inner core 113 are connected by a first inner magnetic bridge 116. The minimum width of the first inner magnetic bridge 116 is W1, where 0.3mm ≤ W1 ≤ 1mm. The first inner magnetic bridge 116 effectively transmits the force on the outer core 112 to the inner core 113, maintaining the integrity of the entire rotor core 100 structure. It prevents the outer core 112 from shifting or deforming relative to the inner core 113 under the action of force, thereby maintaining the structural stability of the rotor core 100. However, if the width of the first inner magnetic bridge 116 is too large, it will lead to increased magnetic flux leakage, while if the width is too small, the strength will not meet the product requirements.

[0056] Reference Figure 3 In one embodiment, the outer iron core 112 is formed by two first magnet slots 111 arranged in a V-shape.

[0057] Reference Figure 5 In one embodiment, the outer iron core 112 is formed by three first magnet slots 111 arranged in a U-shape.

[0058] Reference Figure 4 and Figure 6 The arrangement of the multiple second magnet slots 121 on the second lamination 120 is the same as the arrangement of the multiple first magnet slots 111 on the first lamination 110; in other words, both the first lamination 110 and the second lamination 120 are V-shaped or U-shaped.

[0059] Furthermore, a plurality of second magnet slots 121 define a plurality of sector-shaped portions 123 and an iron core portion 124 located in the middle of the plurality of sector-shaped portions 123 in the circumferential direction of the second lamination 120. The sector-shaped portions 123 are connected to the iron core portion 124 through the second external magnetic bridge 125, and the second magnet slots 121 between the sector-shaped portions 123 and the iron core portion 124 are connected by a connecting slot 122.

[0060] That is, multiple second magnet slots 121 define multiple fan-shaped regions in the circumferential direction of the second stamping 120, and the second magnet slots 121 forming the fan-shaped regions are connected by connecting slots 122 in the direction near the inner side of the second stamping 120; two second magnet slots 121 are connected by connecting slots 122 at the two sides of the fan-shaped regions near the bottom of the inner fan-shaped regions, so that the two second magnet slots 121 are connected and there is no magnetic bridge separating them. The connection through connecting slots 122 can ensure that the magnetic leakage between magnets 200 is reduced.

[0061] Reference Figure 4 and Figure 6Specifically, the thickness of the second outer magnetic bridge 125 in the second magnet slot 121 is W2, where 0.3mm ≤ W2 ≤ 1mm. The thickness of the second outer magnetic bridge 125 in the second magnet slot 121 affects the distribution and conduction of the magnetic field. A suitable thickness of the second outer magnetic bridge 125 allows the magnetic field to be distributed more evenly within the second magnet slot 121. If the thickness of the second outer magnetic bridge 125 is too thin, it may lead to excessive magnetic flux, causing local magnetic saturation of the second outer magnetic bridge 125 and affecting the normal operation of the motor.

[0062] Specifically, both the first lamination 110 and the second lamination 120 are provided with riveting parts, and multiple first laminations 110 and multiple second laminations 120 are riveted together by the riveting parts. The riveting parts are rivets provided on the first laminations 110 and the second laminations 120. The axial laminations are fixed by the rivets to ensure the strength of the overall rotor.

[0063] Furthermore, the magnetic poles of the rotor core 100 can be V-shaped, U-shaped, or even W-shaped, etc., without limitation.

[0064] This utility model also proposes an electric motor, which includes a rotor core 100. The specific structure of the rotor core 100 is as described in the above embodiments. Since this electric motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The electric motor also includes a rotating shaft through which the rotor core 100 passes; a stator on which the rotor core 100 is sleeved, etc.

[0065] Figure 7 The graph shows the relationship between compressor motor energy efficiency and 0.3L1≥L2, illustrating the relationship between the axial stack thickness of two types of laminations and magnetic flux attenuation. The vertical axis represents magnetic flux attenuation, and the horizontal axis represents the stacking relationship between the first lamination 110 and the second lamination 120. The curve in the graph starts to rise from the lower left corner and reaches a higher point at approximately 0.3L1. This means that satisfying the stacking relationship between the first lamination 110 and the second lamination 120, which is 0.3L1≥L2, can ensure reduced magnetic flux leakage while maintaining motor strength. The first lamination 110 mainly simulates magnetic flux leakage, while the second lamination ensures rotor strength.

[0066] Figure 8The graph shows the relationship between motor magnetic energy attenuation and 0.04≤K / D≤0.25. The horizontal axis represents the K / D ratio, which is the ratio of the minimum opening of slot 114 to the outer diameter of the first lamination 110. The vertical axis represents the proportion of motor magnetic energy attenuation, which is an indicator of the degree of motor performance degradation. As can be seen from the graph, as K / D is greater than 0.04 (i.e., the horizontal axis moves to the right), the proportion of motor magnetic energy attenuation shows a downward trend (i.e., the vertical axis moves downward). However, after K / D is greater than 0.25, the proportion of motor magnetic energy attenuation shows an upward trend. This indicates that under the condition of 0.04≤K / D≤0.25, the motor magnetic energy attenuation is relatively small, and the motor performance is relatively good.

[0067] This utility model also proposes a compressor, including the above-mentioned 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.

[0068] The motor and compressor can be used in air conditioning equipment, such as indoor air conditioning units, central air conditioning systems, and automotive air conditioning systems. This utility model also proposes an air conditioning device including the aforementioned compressor or motor.

[0069] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A rotor core, characterized in that, include: Multiple first laminations are provided, with multiple first magnet slots arranged circumferentially on the first laminations. Each first magnet slot has a first outer magnetic bridge near the outer edge of the first lamination, and the first outer magnetic bridge is disconnected. The multiple first magnet slots define multiple outer iron cores and an inner iron core located in the middle of the multiple outer iron cores in the circumferential direction of the first laminations. All of the multiple outer iron cores are connected to the inner iron core. and Multiple second laminations are provided with multiple second magnet slots along the circumferential direction. The second magnet slots have second external magnetic bridges. Multiple first laminations and multiple second laminations are stacked axially to form a rotor core. The total thickness of the multiple first laminations is L1, and the total thickness of the multiple second laminations is L2, satisfying the relationship: 0.3L1≥L2.

2. The rotor core as described in claim 1, characterized in that, The first lamination has multiple opening slots on its outer periphery, and the two first magnet slots of two adjacent outer iron cores are connected through the opening slots; the minimum distance between the slot opening lengths is K, and the outer diameter of the first lamination is D, then K and D satisfy the relationship: 0.04≤K / D≤0.

25.

3. The rotor core as described in claim 2, characterized in that, The first lamination is further provided with a blocking part, which is located at the break of the first outer magnetic bridge of the first magnet slot to prevent the magnet installed in the first magnet slot from detaching from the opening slot.

4. The rotor core as described in claim 1, characterized in that, The outer iron core and the inner iron core are connected by a first inner magnetic bridge, and the minimum width of the first inner magnetic bridge is W1, where 0.3mm≤W1≤1mm.

5. The rotor core as described in claim 1, characterized in that, The outer iron core is formed by two first magnet slots arranged in a V-shape; or, the outer iron core is formed by three first magnet slots arranged in a U-shape.

6. The rotor core as described in claim 5, characterized in that, The arrangement of the multiple second magnet slots on the second lamination is the same as the arrangement of the multiple first magnet slots on the first lamination.

7. The rotor core as described in claim 1, characterized in that, Multiple second magnet slots define multiple sector portions and an iron core portion located in the middle of the multiple sector portions in the circumferential direction of the second lamination. The sector portions are connected to the iron core portion through the second external magnetic bridge, and the second magnet slot between the sector portion and the iron core portion is connected by a connecting slot.

8. The rotor core as described in claim 1, characterized in that, The thickness of the second outer magnetic bridge is W2, where 0.3mm ≤ W2 ≤ 1mm.

9. The rotor core as described in claim 1, characterized in that, Both the first and second laminations are provided with riveting portions, and multiple first laminations and multiple second laminations are riveted together through the riveting portions.

10. An electric motor, characterized in that, Includes the rotor core as described in any one of claims 1 to 9.

11. A compressor, characterized in that, Including the motor as described in claim 10.

12. An air conditioning device, characterized in that, Includes the compressor as described in claim 11.

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