Rotor core

Abstract

The utility model relates to the technical field of motors, and discloses a rotor core, which comprises a rotor core body. The plurality of V-shaped magnet slots are uniformly distributed around the center of the rotor iron core body in the circumferential direction; the magnetic conductive holes and the first riveting points are symmetrically arranged on the two sides of the center line of each V-shaped magnet slot and located between the V-shaped magnet slots and the outer edge of the rotor iron core body; the included angle between the magnetic conductive hole and two adjacent side edges of the V-shaped magnet slot is a2, and a2 is more than or equal to 20 degrees and less than 90 degrees; the included angle between the first riveting point and the two adjacent side edges of the V-shaped magnet slot is a3, and a3 is larger than or equal to 20 degrees and smaller than 90 degrees. The rotor core provided by the utility model can effectively guide magnetic lines of force, reduce magnetic flux loss, and enable the magnetic flux of the permanent magnet to be given a greater play, thereby effectively increasing the permanent magnet torque and improving the motor efficiency.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a rotor core. Background Technology

[0002] Currently, with increasing energy efficiency requirements for rotary compressors, the industry seeks technological breakthroughs, but process limitations often hinder technological innovation. For variable frequency compressor motor rotors, optimizing the magnetic circuit is often achieved through structural iterations. Optimizing the magnetic guide hole is a common method. A well-designed hole can reduce the magnetic reluctance along the d-axis of the V-shaped magnet slots in the motor rotor, maximizing the magnetic flux of the permanent magnets within the slots, thereby increasing permanent magnet torque and improving motor efficiency. However, motor rotor stacking typically uses riveting, and to ensure rotor strength, the riveting points are generally designed on the d-axis of the V-shaped magnet slots. This design not only has little effect on guiding magnetic lines of force but also increases the magnetic reluctance along the d-axis, affecting the magnetic field's effectiveness and thus reducing permanent magnet torque and motor efficiency.

[0003] Therefore, designing a technology that can guide magnetic lines of force while effectively reducing the influence of its own magnetic reluctance is of great significance for improving motor efficiency. Utility Model Content

[0004] To address the shortcomings of the prior art, this utility model provides a rotor core that guides the magnetic lines of force through magnetic guide holes and first rivet points located on both sides of the center line of the V-shaped magnet slot, reducing magnetic flux loss and allowing the permanent magnet flux to be utilized more effectively, thereby increasing the permanent magnet torque and improving motor efficiency.

[0005] The technical effects to be achieved by this utility model are realized through the following technical aspects:

[0006] This utility model provides a rotor core, comprising:

[0007] Rotor core body;

[0008] Multiple V-shaped magnet slots are evenly distributed around the center of the rotor core body, and the V-shaped openings of the V-shaped magnet slots face the outer edge of the rotor core body for the installation and positioning of permanent magnets.

[0009] In addition, magnetic guide holes and first rivet points are symmetrically arranged on both sides of the center line of each of the V-shaped magnet slots, located between the V-shaped magnet slots and the outer edge of the rotor core body, in order to reduce magnetic resistance and increase permanent magnet torque;

[0010] Furthermore, the included angle between the magnetic guide hole and the two adjacent sides of the V-shaped magnet slot is a2, where 20°≤a2<90°;

[0011] The angle between the first rivet point and the two adjacent sides of the V-shaped magnet slot is a3, where 20°≤a3<90°.

[0012] As one preferred embodiment, the magnetic guide hole is an elongated magnetic guide hole or a rectangular magnetic guide hole structure; assuming the length of the magnetic guide hole is L1 and the width is W1, then L1 and W1 satisfy: 1 ​​mm ≤ L1 ≤ 5 mm, 0.4 mm ≤ W1 ≤ 2 mm.

[0013] As one preferred embodiment, assuming the minimum distance between the two first rivet points on each of the V-shaped magnet slots is d1, and the diameter of the rotor core body is d2, then d1 and d2 satisfy: 10 mm ≤ d2 / d1 ≤ 50 mm.

[0014] As one preferred embodiment, assuming the minimum distance between the first rivet point and the outer diameter of the rotor core body is d3, then 0.4 mm ≤ d3 ≤ 1.5 mm.

[0015] As one preferred embodiment, the riveting cross section of the first rivet is elongated or rectangular; assuming the length of the first rivet is L2 and the width is W2, then L2 and W2 satisfy: 1 ​​mm ≤ L2 ≤ 5 mm, 0.4 mm ≤ W2 ≤ 2 mm.

[0016] As one preferred embodiment, the V-shaped magnet slot includes a first side slot and a second side slot arranged symmetrically, and a magnetic barrier slot connected to the first side slot and the second side slot near one end of the V-shaped opening of the V-shaped magnet slot; and the included angle of the V-shaped magnet slot is a1, and 40°≤a1≤160°.

[0017] As one preferred embodiment, the outer edge of the rotor core body is provided with a truncated edge structure at the position corresponding to the q-axis of the V-shaped permanent magnet mounting slot.

[0018] As a preferred embodiment, the rotor core further includes a plurality of internal holes and a plurality of refrigerant channels uniformly arranged in the circumferential direction of the rotor core body, and the distance between the internal holes and the center of the rotor core body is greater than the distance between the refrigerant channels and the center of the rotor core body.

[0019] As one preferred embodiment, the rotor core further includes a plurality of second rivet points evenly arranged in the circumferential direction of the rotor core body, located between the V-shaped magnet slot and the refrigerant channel; and the riveting cross section of the second rivet point is oblong or rectangular.

[0020] As one preferred option, assuming the length of the second rivet point is L3 and the width is W3, then L3 and W3 satisfy: 1 ​​mm ≤ L3 ≤ 5 mm, 0.4 mm ≤ W3 ≤ 2 mm;

[0021] Assuming the minimum distance between the second rivet point and the center of the rotor core body is d4, then 10 mm ≤ d4 ≤ 40 mm.

[0022] In summary, this utility model has at least the following advantages:

[0023] The rotor core provided by this utility model guides the magnetic lines of force through magnetic guide holes and first rivet points set on both sides of the center line of the V-shaped magnet slot, reducing magnetic flux loss and allowing the permanent magnet flux to be fully utilized, thereby effectively increasing the permanent magnet torque and improving motor efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the rotor core in an embodiment of this utility model.

[0025] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle.

[0026] Figure 3 for Figure 1 Enlarged diagram of part B.

[0027] Figure label:

[0028] 10. Rotor core body; 11. Cut-edge structure;

[0029] 20. V-shaped magnet slot; 21. First side slot; 22. Second side slot; 23. Magnetic barrier slot;

[0030] 30. Magnetic guide hole;

[0031] 40. First rivet point;

[0032] 50. Internal hole;

[0033] 60. Refrigerant passage;

[0034] 70. Second rivet point. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] Example 1:

[0038] Please see the appendix Figure 1 The rotor core of this utility model embodiment includes a rotor core body 10, a plurality of V-shaped magnet slots 20 evenly distributed around the center of the rotor core body 10 with V-shaped openings facing the outer edge of the rotor core body 10, and magnetic guide holes 30 and first rivet points 40 symmetrically arranged on both sides of the center line of each V-shaped magnet slot 20 between the V-shaped magnet slot 20 and the outer edge of the rotor core body 10. In the prior art, the center line of the V-shaped magnet slot 20 is generally defined as the d-axis, and the center line between two adjacent V-shaped magnet slots 20 is defined as the q-axis, that is, the magnetic guide holes 30 and the first rivet points 40 are symmetrically arranged on both sides of the d-axis of each V-shaped magnet slot 20.

[0039] The V-shaped magnet slot 20 is used for the installation and positioning of the permanent magnet; preferably, there are 8-12 V-shaped magnet slots 20. The magnetic guide hole 30 is used to guide the magnetic lines of force, reducing magnetic resistance and increasing the permanent magnet torque; the first rivet point 40 is mainly used to realize the stacking connection of the rotor core, preventing it from loosening or shifting during high-speed rotation, and by optimizing its layout, it can increase the guidance of the magnetic lines of force, thereby achieving the purpose of reducing magnetic resistance, increasing permanent magnet torque, and improving motor efficiency. Preferably, each V-shaped magnet slot 20 has two corresponding magnetic guide holes 30 and two first rivet points 40.

[0040] Furthermore, the included angle between the two adjacent sides of the magnetic guide hole 30 and the V-shaped magnet slot 20 is a2, where 20°≤a2<90°, that is, the angle of a2 is 20°-90°; preferably, the angle of a2 is 30°-60°; and the magnetic guide hole 30 can be designed as an elongated magnetic guide hole or a rectangular magnetic guide hole structure according to actual needs. To further optimize the structure of the magnetic guide hole 30, assuming that the length of the magnetic guide hole 30 is L1 and the width is W1, then L1 and W1 satisfy: 1mm≤L1≤5mm, 0.4mm≤W1≤2mm; that is, the length of the magnetic guide hole 30 is 1mm-5mm and the width is 0.4mm-2mm.

[0041] Further, the included angle between the first rivet point 40 and the two adjacent sides of the V-shaped magnet slot 20 is a3, where 20°≤a3<90°; that is, the angle of a3 is 20°-90°; preferably, the angle of a3 is 30°-60°. In this embodiment, the layout design of the first rivet point 40 has been further designed. Specifically, assuming that the minimum distance between the two first rivet points 40 on each V-shaped magnet slot 20 is d1, and the diameter of the rotor core body 10 is d2, then d1 and d2 satisfy: 10 mm≤d2 / d1≤50 mm; assuming that the minimum distance between the first rivet point 40 and the outer diameter of the rotor core body 10 is d3, then 0.4 mm≤d3≤1.5 mm, that is, the minimum distance between the first rivet point 40 and the outer diameter of the rotor core body 10 is 0.4 mm-1.5 mm.

[0042] This embodiment further designs the structure of the first rivet point 40. Specifically, the riveting cross section of the first rivet point 40 can be designed as an elongated shape or a rectangle according to actual needs. Further, assuming that the length of the first rivet point 40 is L2 and the width is W2, then L2 and W2 satisfy: 1 ​​mm ≤ L2 ≤ 5 mm, 0.4 mm ≤ W2 ≤ 2 mm; that is, the length of the first rivet point 40 is 1 mm - 5 mm and the width is 0.4 mm - 2 mm.

[0043] In this embodiment, the rotor core optimizes the design of the magnetic guide hole 30 and the first rivet point 40, placing the magnetic guide hole 30 and the first rivet point 40 on both sides of the center line of the V-shaped magnet slot 20 to guide the magnetic lines of force, reduce magnetic flux loss, and allow the permanent magnet flux to be utilized more effectively, thereby increasing the permanent magnet torque and improving the motor efficiency.

[0044] Example 2:

[0045] Please see the appendix Figure 1 The rotor core of this embodiment is the same as that of Embodiment 1, both including a rotor core body 10, a plurality of V-shaped magnet slots 20 evenly distributed around the center of the rotor core body 10 with their V-shaped openings facing the outer edge of the rotor core body 10, and magnetic guide holes 30 and first rivet points 40 symmetrically arranged on both sides of the center line of each V-shaped magnet slot 20 between the V-shaped magnet slot 20 and the outer edge of the rotor core body 10. The main difference is that this embodiment further designs the V-shaped magnet slots 20 based on Embodiment 1, as detailed below:

[0046] Please see the appendix Figure 1 and 2The V-shaped magnet slot 20 includes a symmetrically arranged first side slot 21 and second side slot 22, and a magnetic barrier slot 23 connected to the first side slot 21 and second side slot 22 near the V-shaped opening of the V-shaped magnet slot 20. The first side slot 21 and second side slot 22 are mainly used for the installation and positioning of the permanent magnet; the magnetic barrier slot 23 is used to optimize the overall structure of the motor rotor, so that when the motor rotor is applied to a permanent magnet synchronous motor and compressor, it can effectively improve the electromagnetic excitation force and optimize the corresponding frequency band electromagnetic force while ensuring electromagnetic torque, thereby effectively reducing the vibration and noise of the compressor. Preferably, the included angle of the V-shaped magnet slot 20 is a1, and 40°≤a1≤160°, that is, the included angle of the V-shaped magnet slot 20 formed by the combination of the first side slot 21 and the second side slot 22 is 40°-160°; more preferably, the included angle of the V-shaped magnet slot 20 formed by the combination of the first side slot 21 and the second side slot 22 is 75°-135°.

[0047] In this embodiment, the rotor core, through the optimized design of the V-shaped magnet slot 20, can effectively improve the electromagnetic excitation force of the rotor core when applied to permanent magnet synchronous motors and compressors, optimize the corresponding frequency band electromagnetic force, thereby effectively reducing the vibration and noise of the compressor.

[0048] Example 3:

[0049] Please see the appendix Figure 1-3 The rotor core of this embodiment is the same as that of Embodiment 1, both including a rotor core body 10, a plurality of V-shaped magnet slots 20 evenly distributed around the center of the rotor core body 10 with their V-shaped openings facing the outer edge of the rotor core body 10, and magnetic guide holes 30 and first rivet points 40 symmetrically arranged on both sides of the center line of each V-shaped magnet slot 20 between the V-shaped magnet slot 20 and the outer edge of the rotor core body 10. The main difference is that, based on Embodiment 1, this embodiment further designs the overall structure of the rotor core, as detailed below:

[0050] Furthermore, a tangent structure 11 is provided on the outer edge of the rotor core body 10 at the position corresponding to the V-shaped permanent magnet mounting slot q axis, which causes an air gap structure to be formed between the outer periphery of the rotor core and the motor stator, which is large near the center line of the q axis and small far from the center line of the q axis. This can effectively weaken the harmonics of the air gap magnetic field, reduce the waveform distortion rate and cogging torque, thereby reducing the noise of the motor and improving the operating efficiency of the motor.

[0051] Furthermore, the rotor core also includes a plurality of internal holes 50 and a plurality of refrigerant channels 60 uniformly arranged in the circumferential direction of the rotor core body 10, and the distance between the internal holes 50 and the center of the rotor core body 10 is greater than the distance between the refrigerant channels 60 and the center of the rotor core body 10. The internal holes 50 and the refrigerant channels 60 are mainly used to improve the overall ventilation effect of the motor and effectively reduce the temperature rise of the motor; preferably, the internal holes 50 and the refrigerant channels 60 are symmetrically arranged on both sides of any q-axis of the V-shaped permanent magnet mounting slot, and the number of internal holes 50 is 4-6, and the number of refrigerant channels 60 is 4-8.

[0052] Furthermore, the rotor core also includes multiple second rivet points evenly arranged in the circumferential direction of the rotor core body 10, located between the V-shaped magnet slot 20 and the refrigerant channel 60. These second rivet points are mainly used to strengthen the riveting of the motor rotor and improve the overall stability of the motor rotor structure. Preferably, the number of second rivet points is 4-8, and they are arranged one-to-one with the refrigerant channel 60. Please refer to the appendix. Figure 1 and 3 The riveting cross-section of the second rivet can be designed as an elongated shape or a rectangle according to actual needs. Furthermore, assuming the length of the second rivet is L3 and the width is W3, then L3 and W3 satisfy: 1 ​​mm ≤ L3 ≤ 5 mm, 0.4 mm ≤ W3 ≤ 2 mm; that is, the length of the second rivet is 1 mm - 5 mm, and the width is 0.4 mm - 2 mm. Assuming the minimum distance between the second rivet and the center of the rotor core body 10 is d4, then 10 mm ≤ d4 ≤ 40 mm; that is, the minimum distance between the second rivet and the center of the rotor core body 10 is 10 mm - 40 mm.

[0053] In this embodiment, the rotor core, through optimized overall design, can effectively improve the noise, temperature rise, efficiency, and stability of the rotor core when applied to permanent magnet synchronous motors and compressors, thereby optimizing the overall performance of permanent magnet synchronous motors and compressors.

[0054] As can be seen from the technical solutions of the above embodiments, the present invention provides a rotor core that can effectively guide magnetic lines of force, reduce magnetic flux loss, and allow permanent magnet flux to be utilized more effectively, thereby effectively increasing permanent magnet torque and improving motor efficiency.

[0055] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0057] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0058] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A rotor core characterized by, The application relates to a rotor core body (10) comprising: a plurality of V-shaped magnet slots (20) uniformly distributed around the center of the rotor core body (10) and having V-shaped openings facing the outer edge of the rotor core body (10) for the installation and positioning of permanent magnets; a magnetic conductive hole (30) and a first rivet point (40) symmetrically arranged on the center line of each V-shaped magnet slot (20) between the V-shaped magnet slot (20) and the outer edge of the rotor core body (10) for reducing magnetic resistance and increasing permanent magnet torque; the included angle between the magnetic conductive hole (30) and two adjacent sides of the V-shaped magnet slot (20) is a2, and 20 DEG <= a2 < 90 DEG; the included angle between the first rivet point (40) and two adjacent sides of the V-shaped magnet slot (20) is a3, and 20 DEG <= a3 < 90 DEG. The magnetic conductive hole (30) is a long-waisted or rectangular magnetic conductive hole structure; assuming that the length of the magnetic conductive hole (30) is L1 and the width is W1, L1 and W1 satisfy 1mm <= L1 <= 5mm and 0.4mm <= W1 <= 2mm.

2. The rotor core according to claim 1, characterized by Assuming that the minimum distance between two first rivet points (40) corresponding to each V-shaped magnet slot (20) is d1, and the diameter of the rotor core body (10) is d2, d1 and d2 satisfy 10mm <= d2 / d1 <= 50mm.

3. The rotor core according to claim 1, characterized by Assuming that the minimum distance between the first rivet point (40) and the outer diameter of the rotor core body (10) is d3, 0.4mm <= d3 <= 1.5mm.

4. The rotor core according to claim 1, characterized by The riveting section of the first rivet point (40) is long-waisted or rectangular; assuming that the length of the first rivet point (40) is L2 and the width is W2, L2 and W2 satisfy 1mm <= L2 <= 5mm and 0.4mm <= W2 <= 2mm.

5. The rotor core according to claim 1, characterized by The V-shaped magnet slot (20) comprises symmetrically arranged first and second side slots (21 and 22) and a magnetic barrier slot (23) connected to the first and second side slots (21 and 22) adjacent to the V-shaped opening of the V-shaped magnet slot (20).

6. The rotor core according to claim 1, characterized by The inner included angle of the V-shaped magnet slot (20) is a1, and 40 DEG <= a1 <= 160 DEG. The outer edge of the rotor core body (10) is provided with a trimming structure (11) corresponding to the q-axis position of the V-shaped magnet slot (20).

7. The rotor core according to claim 1, characterized by A plurality of internal holes (50) and a plurality of refrigerant channels (60) are uniformly arranged in the circumferential direction of the rotor core body (10), and the distance between the internal hole (50) and the center of the rotor core body (10) is greater than the distance between the refrigerant channel (60) and the center of the rotor core body (10).

8. The rotor core according to claim 1, characterized by A plurality of second rivet points are uniformly arranged in the circumferential direction of the rotor core body (10) between the V-shaped magnet slot (20) and the refrigerant channel (60), and the riveting section of the second rivet point is long-waisted or rectangular.

9. The rotor core according to claim 8, characterized by Assuming that the length of the second rivet point is L3 and the width is W3, L3 and W3 satisfy 1mm <= L3 <= 5mm and 0.4mm <= W3 <= 2mm.

10. The rotor core according to claim 9, characterized by ​ Assuming the minimum distance of the second rivet point from the center of the rotor core body (10) is d4, 10mm ≤ d4 ≤ 40mm.

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