Motor rotor

Abstract

The utility model relates to the technical field of motors, and discloses a motor rotor, which comprises a rotor iron core. The plurality of V-shaped magnet slots are uniformly arranged in the circumferential direction of the rotor iron core at intervals by taking the circle center of the rotor iron core as the center, and are used for mounting and limiting permanent magnets; the magnetic isolation groove is connected to the end part of the V-shaped magnet slot and is used for improving electromagnetic exciting force; the trimming structure corresponds to the symmetric center line of the two adjacent V-shaped magnet slots and is arranged on the outer edge of the rotor core; the side edge, close to the trimming structure, of the magnetic isolation groove is parallel to the trimming structure, a magnetic isolation bridge is formed between the magnetic isolation groove and the trimming structure, and a1 / a2 * (d1-d2) is larger than or equal to 5.2 mm and smaller than or equal to 7.5 mm. According to the motor rotor provided by the utility model, the air gap flux density waveform is optimized and the cogging torque is reduced by balancing the relationship between the V-shaped magnet slots and the magnetic isolation bridges, so that the total noise of the motor is optimized.

Description

Technical Field

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

[0002] Current trends in the market for vertical rotary compressors are high energy efficiency, miniaturization, improved noise reduction, and low cost. The industry is experiencing increasingly rapid product updates, especially since the implementation of the new national standards. Older product designs have lost their market competitiveness. As a crucial component of the compressor, the motor is undergoing continuous structural iteration based on the widespread adoption of inverter technology to cope with increasingly fierce industry competition. Noise reduction, in particular, is a significant challenge for the industry.

[0003] In existing technologies, to meet energy efficiency requirements, motors typically increase torque density and current, leading to a larger armature magnetic field and consequently, increased cogging torque. This also increases the unbalanced force on one side of the rotor, resulting in worsened motor noise. Therefore, to overcome this technical problem, it is generally necessary to optimize the rotor structure, reduce cogging torque, and optimize the air gap magnetic flux density waveform. Optimization of both cogging torque and air gap magnetic flux density waveform can be achieved by adjusting the angle between the V-shaped magnet slots, the size of the magnetic isolation slots at the ends of the V-shaped magnet slots, and the angular and dimensional relationships between them, thus optimizing the cogging torque and air gap magnetic flux density waveform to effectively suppress motor noise. Utility Model Content

[0004] With a given magnetic bridge width, the smaller the angle between the V-shaped magnet slots, the closer the air gap magnetic flux density is to a sine wave, resulting in smaller torque fluctuations and less electromagnetic vibration. However, to maintain the magnetomotive force, the number of magnets needs to be increased. When the magnetic flux density increases excessively to saturation, the excitation current increases rapidly, and the motor power decreases sharply. Therefore, excessively high magnetic flux density can cause electromagnetic vibration, increase cogging torque, and simultaneously create a large unilateral magnetic pull when the stator and rotor are misaligned, thus increasing the electromagnetic noise of the motor. To address the shortcomings of the prior art, this invention provides a motor rotor that optimizes the air gap magnetic flux density waveform and reduces cogging torque by balancing the relationship between the V-shaped magnet slots and the magnetic bridge, thereby optimizing the overall noise of the applied motor.

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

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

[0007] Rotor core;

[0008] Multiple V-shaped magnet slots are evenly spaced around the center of the rotor core in the circumferential direction of the rotor core for the installation and positioning of permanent magnets.

[0009] A magnetic isolation groove, connected to the end of the V-shaped magnet slot, is used to improve the electromagnetic excitation force;

[0010] And the tangential structure, corresponding to the symmetrical center line of the two adjacent V-shaped magnet slots, is disposed on the outer edge of the rotor core;

[0011] The magnetic isolation groove is adjacent to the side of the tangential structure and is parallel to the tangential structure, forming a magnetic isolation bridge between them, and satisfying 5.2 mm ≤ a1 / a2 × (d1 - d2) ≤ 7.5 mm;

[0012] Wherein, a1 is the inner included angle of the V-shaped magnet slot, a2 is the included angle between the d-axis and q-axis of the V-shaped magnet slot, d1 is the distance between the side of the magnetic isolation groove adjacent to the center of the rotor core and the tangential structure, and d2 is the distance between the side of the magnetic isolation groove adjacent to the tangential structure and the tangential structure.

[0013] As one preferred embodiment, assuming the centerline of the V-shaped magnet slot is the d-axis, the axis of symmetry between two adjacent V-shaped magnet slots is the q-axis, and the angle between the d-axis and the q-axis is a2, then a2 satisfies: 20°≤a2≤30°.

[0014] As one preferred embodiment, the V-shaped magnet slot includes a first side slot and a second side slot arranged symmetrically, and both the first side slot and the second side slot include straight edges of the first side slot and the second side slot that are parallel to each other.

[0015] Assuming the length of the straight edge of the first side groove is L1, the length of the straight edge of the second side groove is L2, and the distance between the straight edges of the first and second side grooves is W1, then L1, L2, and W1 satisfy:

[0016] 3 mm ≤ L1 ≤ 15 mm, 3 mm ≤ L2 ≤ 15 mm, 0.7 mm ≤ W1 ≤ 2.5 mm.

[0017] As one preferred embodiment, the included angle of the V-shaped magnet slot is a1, and 30°≤a1≤160°.

[0018] As one preferred embodiment, the magnetic shielding groove includes a first magnetic shielding side and a second magnetic shielding side that are connected to both sides of the V-shaped magnet slot and parallel to the cut edge structure, and a third magnetic shielding side that is opposite to the V-shaped magnet slot and connected between the first magnetic shielding side and the second magnetic shielding side.

[0019] As one preferred embodiment, the first and second magnetic shielding sides are both straight edge structures perpendicular to the symmetrical center line of the two adjacent V-shaped magnet slots; the third magnetic shielding side is an arc-shaped edge structure connecting the first and second magnetic shielding sides.

[0020] As one preferred embodiment, assuming the distance between the side of the magnetic isolation slot near the center of the rotor core and the tangential structure is d1, then d1 satisfies: 1 mm ≤ d1 ≤ 3 mm;

[0021] Assuming the distance between the side edge of the magnetic shielding groove adjacent to the tangential structure and the tangential structure is d2, then d2 satisfies: 0.35 mm ≤ d2 ≤ 0.7 mm;

[0022] Assuming the length of the magnetic isolation groove adjacent to the side of the tangential structure is L4, then L4 satisfies: 1.5 mm ≤ L3 ≤ 7.5 mm.

[0023] As one preferred embodiment, assuming the length of the tangent structure is L3, then L3 satisfies: 3 mm ≤ L3 ≤ 15 mm.

[0024] As one preferred embodiment, assuming the outer diameter of the rotor core is d0, then d0 satisfies: 30 mm ≤ d0 ≤ 70 mm.

[0025] As one preferred embodiment, the motor rotor further includes a first magnetic guide hole symmetrically disposed on both sides of the center line of each V-shaped magnet slot and located between the V-shaped magnet slot and the outer edge of the rotor core; a second magnetic guide hole corresponding to the first magnetic guide hole and symmetrically disposed on both sides of the center line of each V-shaped magnet slot; and a plurality of internal holes and a plurality of refrigerant channels uniformly disposed in the circumferential direction of the rotor core.

[0026] Furthermore, the distance between the internal hole and the center of the rotor core is greater than the distance between the refrigerant channel and the center of the rotor core.

[0027] In summary, this utility model has at least the following advantages:

[0028] The motor rotor provided by this invention optimizes the air gap magnetic flux density waveform and reduces cogging torque by balancing the relationship between the V-shaped magnet slot and the magnetic isolation bridge, thereby optimizing the overall noise of the applied motor. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the motor rotor in an embodiment of this utility model.

[0030] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle.

[0031] Figure 3 for Figure 1 Enlarged diagram of part B.

[0032] Figure label:

[0033] 10. Rotor core;

[0034] 20. V-shaped magnet slot; 21. First side slot; 22. Second side slot; 201. Straight edge of the first side slot; 202. Straight edge of the second side slot;

[0035] 30. Magnetic shielding groove; 31. First magnetic shielding side; 32. Second magnetic shielding side; 33. Third magnetic shielding side;

[0036] 40. Cut-edge structure;

[0037] 50. Magnetic bridge;

[0038] 60. First magnetic guide hole;

[0039] 70. Second magnetic guide hole;

[0040] 80. Internal hole;

[0041] 90. Refrigerant passage. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] Example 1:

[0045] Please see the appendix Figure 1 The motor rotor of this utility model embodiment includes a rotor core 10, a plurality of V-shaped magnet slots 20 evenly spaced around the center of the rotor core 10 in the circumferential direction, magnetic isolation grooves 30 connected to the ends of the V-shaped magnet slots 20, and a tangent structure 40 corresponding to the symmetrical center line of two adjacent V-shaped magnet slots 20 and disposed on the outer edge of the rotor core 10. The rotor core 10 is the core component of the motor rotor, which is generally made of multiple high magnetic permeability materials (such as silicon steel sheets) stacked and riveted together. The V-shaped magnet slots 20 are used for the installation and positioning of permanent magnets. The magnetic isolation grooves 30 are used to improve electromagnetic excitation force, optimize magnetic field distribution, and reduce leakage magnetic loss, thereby improving motor efficiency and reducing motor noise.

[0046] Furthermore, the side of the magnetic isolation groove 30 adjacent to the tangential structure 40 is parallel to the tangential structure 40, forming a magnetic isolation bridge 50 between them; and satisfies 5.2 mm ≤ a1 / a2 × (d1-d2) ≤ 7.5 mm; where a1 is the inner included angle of the V-shaped magnet slot 20, a2 is the included angle between the d axis and the q axis of the V-shaped magnet slot 20, d1 is the distance between the side of the magnetic isolation groove 30 adjacent to the center of the rotor core 10 and the tangential structure 40, and d2 is the distance between the side of the magnetic isolation groove 30 adjacent to the tangential structure 40 and the tangential structure 40. The value of a2 is determined by the number of rotor poles. When a2 is constant, the smaller a1 is, the closer the air gap magnetic flux density is to a sine wave, which is beneficial to vibration and noise. However, at the same time, the amount of magnets used increases, the magnetic flux density increases, which is detrimental to noise. In addition, the larger d1-d2 is, the larger the magnetic isolation hole is, which can reduce cogging rotation and is beneficial to noise. Therefore, when a1 / a2×(d1-d2) falls within the range of 5.2 mm to 7.5 mm, it is beneficial to motor noise.

[0047] In this embodiment, with a certain width of the magnetic bridge 50, the smaller the included angle of the V-shaped magnet slots 20, the closer the air gap magnetic flux density is to a sine wave, resulting in smaller torque fluctuations and less electromagnetic vibration. However, to maintain the magnetomotive force, the number of magnets needs to be increased. When the magnetic flux density increases excessively to saturation, the excitation current increases rapidly, and the motor power decreases sharply. Therefore, excessively high magnetic flux density can cause electromagnetic vibration, increase cogging torque, and simultaneously cause a large unilateral magnetic pull when the stator and rotor are not concentric, thereby increasing the electromagnetic noise of the motor. In summary, this embodiment provides a motor rotor that optimizes the air gap magnetic flux density waveform and reduces cogging torque by balancing the relationship between the V-shaped magnet slots 20 and the magnetic bridge 50, thereby optimizing the overall noise of the applied motor.

[0048] Example 2:

[0049] Please see the appendix Figure 1The motor rotor of this embodiment is the same as that of Embodiment 1, including a rotor core 10, a plurality of V-shaped magnet slots 20 evenly spaced around the center of the rotor core 10 in the circumferential direction, magnetic isolation grooves 30 connected to the ends of the V-shaped magnet slots 20, and a tangential structure 40 corresponding to the symmetrical center line of two adjacent V-shaped magnet slots 20 and disposed on the outer edge of the rotor core 10; the magnetic isolation grooves 30 are adjacent to the sides of the tangential structure 40. Parallel to the tangential structure 40, a magnetic bridge 50 is formed between them; and it satisfies 5.2 mm ≤ a1 / a2 × (d1-d2) ≤ 7.5 mm; where a1 is the inner included angle of the V-shaped magnet slot 20, a2 is the included angle between the d-axis and q-axis of the V-shaped magnet slot 20, d1 is the distance between the side of the magnetic isolation groove 30 near the center of the rotor core 10 and the tangential structure 40, and d2 is the distance between the side of the magnetic isolation groove 30 near the tangential structure 40 and the tangential structure 40. The main difference is that, based on Embodiment 1, this embodiment further designs the motor rotor, as follows:

[0050] Please see the appendix Figure 1 Assuming the centerline of the V-shaped magnet slot 20 is the d-axis, the axis of symmetry between two adjacent V-shaped magnet slots 20 is the q-axis, and the angle between the d-axis and the q-axis is a2, then a2 satisfies: 20°≤a2≤30°; that is, the angle a2 between the d-axis and the q-axis is 20°-30°. Further, the inner angle of the V-shaped magnet slot 20 is a1, and 30°≤a1≤160°; that is, the inner angle a1 of the V-shaped magnet slot 20 is 30°-160°, preferably 60°-120°.

[0051] Please refer to the appendix for further details. Figure 2 and 3 The V-shaped magnet slot 20 includes a symmetrically arranged first side slot 21 and a second side slot 22. Each of the first side slot 21 and the second side slot 22 includes a first side slot straight edge 201 and a second side slot straight edge 202 that are parallel to each other. Further, assuming the length of the first side slot straight edge 201 is L1, the length of the second side slot straight edge 202 is L2, and the distance between the first side slot straight edges 201 and 202 is W1, then L1, L2, and W1 satisfy: 3 mm ≤ L1 ≤ 15 mm, 3 mm ≤ L2 ≤ 15 mm, and 0.7 mm ≤ W1 ≤ 2.5 mm. That is, the length L1 of the first side slot straight edge 201 and the length L2 of the second side slot straight edge 202 are both 3 mm - 15 mm, and the distance W1 between the first side slot straight edges 201 and 202 is 0.7 mm - 2.5 mm.

[0052] Please see the appendix Figure 1-3The magnetic shielding groove 30 includes a first magnetic shielding side 31 and a second magnetic shielding side 32 that connect to both sides of the V-shaped magnet slot 20 and are parallel to the cut edge structure 40, and a third magnetic shielding side 33 that is opposite to the V-shaped magnet slot 20 and connects between the first magnetic shielding side 31 and the second magnetic shielding side 32. Further, the first magnetic shielding side 31 and the second magnetic shielding side 32 are both straight edge structures perpendicular to the symmetrical center line of the two adjacent V-shaped magnet slots 20; the third magnetic shielding side 33 is an arc-shaped edge structure connecting the first magnetic shielding side 31 and the second magnetic shielding side 32. This allows the magnetic shielding groove 30 to form a long, waist-shaped structure that connects to the V-shaped magnet slot 20, improving electromagnetic excitation force, optimizing magnetic field distribution, reducing leakage magnetic loss, thereby improving motor efficiency and reducing motor noise.

[0053] To further optimize the overall structure of the motor rotor, maximize the electromagnetic excitation force, optimize the magnetic field distribution, and reduce leakage magnetic losses, further, assuming the distance between the side of the magnetic isolation slot 30 near the center of the rotor core 10 and the tangential structure 40 is d1, then d1 satisfies: 1 mm ≤ d1 ≤ 3 mm; that is, the distance d1 between the side of the magnetic isolation slot 30 near the center of the rotor core 10 and the tangential structure 40 is 1 mm - 3 mm. Assuming the distance between the side of the magnetic isolation slot 30 near the tangential structure 40 and the tangential structure 40 is d2, then d2 satisfies: 0.35 mm ≤ d2 ≤ 0.7 mm; that is, the distance d2 between the side of the magnetic isolation slot 30 near the tangential structure 40 and the tangential structure 40 is 0.35 mm - 0.7 mm. Furthermore, assuming the length of the magnetic isolation slot 30 adjacent to the tangential structure 40 is L4, then L4 satisfies: 1.5 mm ≤ L3 ≤ 7.5 mm; that is, the length L4 of the magnetic isolation slot 30 adjacent to the tangential structure 40 is 1.5 mm - 7.5 mm. Preferably, assuming the outer diameter of the rotor core 10 is d0, then d0 satisfies: 30 mm ≤ d0 ≤ 70 mm; that is, the outer diameter d0 of the rotor core 10 is 30 mm - 70 mm, which can be designed according to actual needs.

[0054] In this embodiment, the motor rotor, based on embodiment 1, further balances the relationship between the V-shaped magnet slot 20 and the magnetic isolation bridge 50, which not only optimizes the air gap magnetic flux density waveform and reduces cogging torque, but also effectively optimizes the overall noise of the applied motor.

[0055] Example 3:

[0056] Please see the appendix Figure 1The motor rotor of this embodiment is the same as that of Embodiment 1 or 2, including a rotor core 10, a plurality of V-shaped magnet slots 20 evenly spaced around the center of the rotor core 10 in the circumferential direction, magnetic isolation grooves 30 connected to the ends of the V-shaped magnet slots 20, and a tangential structure 40 corresponding to the symmetrical center line of two adjacent V-shaped magnet slots 20 and disposed on the outer edge of the rotor core 10; the magnetic isolation grooves 30 are adjacent to the sides of the tangential structure 40. Parallel to the tangential structure 40, a magnetic bridge 50 is formed between them; and it satisfies 5.2 mm ≤ a1 / a2 × (d1-d2) ≤ 7.5 mm; where a1 is the inner included angle of the V-shaped magnet slot 20, a2 is the included angle between the d-axis and q-axis of the V-shaped magnet slot 20, d1 is the distance between the side of the magnetic isolation slot 30 near the center of the rotor core 10 and the tangential structure 40, and d2 is the distance between the side of the magnetic isolation slot 30 near the tangential structure 40 and the tangential structure 40. The main difference is that this embodiment, based on embodiment 1 or 2, further designs the motor rotor, as follows:

[0057] Please see the appendix Figure 1-3 The motor rotor also includes a first magnetic guide hole 60 symmetrically arranged on both sides of the centerline of each V-shaped magnet slot 20, located between the V-shaped magnet slot 20 and the outer edge of the rotor core 10; a second magnetic guide hole 70 corresponding to the first magnetic guide hole 60 and symmetrically arranged on both sides of the centerline of each V-shaped magnet slot 20; and a plurality of internal holes 80 and a plurality of refrigerant channels 90 uniformly arranged in the circumferential direction of the rotor core 10; furthermore, the distance between the internal holes 80 and the center of the rotor core 10 is greater than the distance between the refrigerant channels 90 and the center of the rotor core 10. The first magnetic guide hole 60 and the second magnetic guide hole 70 are symmetrically arranged on both sides of the d-axis of each V-shaped magnet slot 20 to optimize the magnetic field distribution and reduce leakage magnetic loss; the internal holes 80 not only reduce the mass of the rotor core 10, decrease the moment of inertia, and improve the starting, stopping, and speed regulation response speed of the motor, but also effectively improve the heat dissipation efficiency of the motor rotor; the refrigerant channels 90 are mainly used for heat dissipation of the motor rotor.

[0058] In this embodiment, the motor rotor can effectively reduce the motor's heat dissipation efficiency and operating efficiency by balancing the relationship between the V-shaped magnet slot 20 and the magnetic isolation bridge 50, optimizing the air gap magnetic flux density waveform, reducing cogging torque, and optimizing the overall noise of the applied motor.

[0059] As can be seen from the technical solutions of the above embodiments, the present invention provides a motor rotor that optimizes the air gap magnetic flux density waveform and reduces cogging torque by balancing the relationship between the V-shaped magnet slot and the magnetic isolation bridge, thereby optimizing the overall noise of the applied motor.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 motor rotor, characterized in that, include: Rotor core (10); Multiple V-shaped magnet slots (20) are evenly spaced around the center of the rotor core (10) in the circumferential direction of the rotor core (10) for the installation and positioning of permanent magnets; A magnetic isolation groove (30) is connected to the end of the V-shaped magnet slot (20) to improve the electromagnetic excitation force; And a tangent structure (40) is provided on the outer edge of the rotor core (10) corresponding to the symmetrical center line of the two adjacent V-shaped magnet slots (20); The magnetic isolation groove (30) is adjacent to the side of the tangential structure (40) and is parallel to the tangential structure (40), forming a magnetic isolation bridge (50) between them, and satisfying 5.2 mm ≤ a1 / a2 × (d1-d2) ≤ 7.5 mm; Wherein, a1 is the inner included angle of the V-shaped magnet slot (20), a2 is the included angle between the d-axis and q-axis of the V-shaped magnet slot (20), d1 is the distance between the side of the magnetic isolation groove (30) adjacent to the center of the rotor core (10) and the tangent structure (40), and d2 is the distance between the side of the magnetic isolation groove (30) adjacent to the tangent structure (40) and the tangent structure (40).

2. The motor rotor according to claim 1, characterized in that, Assuming the centerline of the V-shaped magnet slot (20) is the d-axis, the axis of symmetry between two adjacent V-shaped magnet slots (20) is the q-axis, and the angle between the d-axis and the q-axis is a2, then a2 satisfies: 20°≤a2≤30°.

3. The motor rotor according to claim 1, characterized in that, The V-shaped magnet slot (20) includes a first side slot (21) and a second side slot (22) arranged symmetrically. The first side slot (21) and the second side slot (22) each include a first side slot straight edge (201) and a second side slot straight edge (202) that are parallel to each other. Assuming the length of the first side groove straight edge (201) is L1, the length of the second side groove straight edge (202) is L2, and the distance between the first side groove straight edge (201) and the second side groove straight edge (202) is W1, then L1, L2, and W1 satisfy: 3 mm ≤ L1 ≤ 15 mm, 3 mm ≤ L2 ≤ 15 mm, 0.7 mm ≤ W1 ≤ 2.5 mm.

4. The motor rotor according to claim 1, characterized in that, The included angle of the V-shaped magnet slot (20) is a1, and 30°≤a1≤160°.

5. The motor rotor according to claim 1, characterized in that, The magnetic shielding groove (30) includes a first magnetic shielding side (31) and a second magnetic shielding side (32) that are connected to both sides of the V-shaped magnet slot (20) and parallel to the cut edge structure (40), and a third magnetic shielding side (33) that is opposite to the V-shaped magnet slot (20) and connected between the first magnetic shielding side (31) and the second magnetic shielding side (32).

6. The motor rotor according to claim 5, characterized in that, The first magnetic shielding side (31) and the second magnetic shielding side (32) are both straight edge structures perpendicular to the symmetrical center line of the two adjacent V-shaped magnet slots (20); the third magnetic shielding side (33) is an arc-shaped edge structure connecting the first magnetic shielding side (31) and the second magnetic shielding side (32).

7. The motor rotor according to claim 1, characterized in that, Assuming that the distance between the side edge of the magnetic isolation groove (30) near the center of the rotor core (10) and the tangent structure (40) is d1, then d1 satisfies: 1 mm ≤ d1 ≤ 3 mm; Assuming the distance between the side edge of the magnetic shielding groove (30) adjacent to the tangent structure (40) and the tangent structure (40) is d2, then d2 satisfies: 0.35 mm ≤ d2 ≤ 0.7 mm; Assuming the length of the magnetic shielding groove (30) adjacent to the side of the tangent structure (40) is L4, then L4 satisfies: 1.5 mm ≤ L3 ≤ 7.5 mm.

8. The motor rotor according to claim 1, characterized in that, Assuming the length of the tangent structure (40) is L3, then L3 satisfies: 3 mm ≤ L3 ≤ 15 mm.

9. The motor rotor according to claim 1, characterized in that, Assuming the outer diameter of the rotor core (10) is d0, then d0 satisfies: 30 mm ≤ d0 ≤ 70 mm.

10. The motor rotor according to claim 1, characterized in that, It also includes a first magnetic guide hole (60) symmetrically disposed on both sides of the center line of each V-shaped magnet slot (20) and located between the outer edge of the V-shaped magnet slot (20) and the rotor core (10); a second magnetic guide hole (70) corresponding to the first magnetic guide hole (60) and symmetrically disposed on both sides of the center line of each V-shaped magnet slot (20); and a plurality of internal holes (80) and a plurality of refrigerant channels (90) uniformly disposed in the circumferential direction of the rotor core (10); Furthermore, the distance between the internal hole (80) and the center of the rotor core (10) is greater than the distance between the refrigerant channel (90) and the center of the rotor core (10).

Images