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 permanent magnet mounting grooves are uniformly distributed in the circumferential direction of the axis of the rotor iron core and are used for mounting permanent magnets; and the magnetic barrier grooves are symmetrically arranged at the V-shaped opening end part of the V-shaped permanent magnet mounting groove and comprise a first magnetic barrier region connected to the V-shaped opening end part of the V-shaped permanent magnet mounting groove and a second magnetic barrier region connected to one end, far away from the V-shaped permanent magnet mounting groove, of the first magnetic barrier region. The utility model provides a motor rotor, which can be applied to a permanent magnet synchronous motor and a compressor, and effectively improves electromagnetic exciting force and optimizes electromagnetic force of a corresponding frequency band on the basis of ensuring electromagnetic torque, thereby effectively reducing vibration and noise of the compressor.

Description

Technical Field

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

[0002] Permanent magnet synchronous motors typically consist of a rotor assembly and a stator assembly. The rotor assembly rotates around its axis of rotation, while the stator assembly is located on the outer periphery of the rotor assembly, forming an air gap between them. The rotor assembly generally includes a rotor core, permanent magnets mounted on the rotor core, and magnetic isolation holes and magnetic barrier slots formed on the rotor core.

[0003] Permanent magnet synchronous motors can be used in fans, compressors, machine tools and other mechanical equipment, with a wide range of applications, especially in compressors. However, regardless of the type of equipment they are used in, the electromagnetic excitation force generated by permanent magnet synchronous motors can easily cause the equipment to vibrate, thereby generating noise at a certain frequency. Moreover, the noise peak generated at the electrical frequency is relatively large.

[0004] Therefore, how to suppress the electromagnetic excitation force of the electric frequency to achieve low vibration and low noise while maintaining the output of electromagnetic torque to ensure the performance requirements of the compressor is a technical problem that urgently needs to be solved. Utility Model Content

[0005] To address the shortcomings of the existing technology, this utility model provides a motor rotor. By adding a magnetic barrier groove at the end of the V-shaped permanent magnet mounting groove, the overall structure of the motor rotor is optimized. This allows the motor rotor to be used in permanent magnet synchronous motors and compressors. While ensuring electromagnetic torque, it effectively improves electromagnetic excitation force and optimizes the corresponding frequency band electromagnetic force, thereby effectively reducing compressor vibration and noise.

[0006] The technical effects to be achieved by this utility model are realized through the following technical aspects:

[0007] In a first aspect, this utility model provides a motor rotor, comprising:

[0008] Rotor core;

[0009] Multiple V-shaped permanent magnet mounting slots are evenly distributed around the axis of the rotor core for mounting permanent magnets;

[0010] And a magnetic barrier groove, symmetrically disposed at the V-shaped opening end of the V-shaped permanent magnet mounting groove, including a first magnetic barrier region connected to the V-shaped opening end of the V-shaped permanent magnet mounting groove, and a second magnetic barrier region connected to the end of the first magnetic barrier region away from the V-shaped permanent magnet mounting groove.

[0011] As one preferred embodiment, assuming that the angle between the first magnetic barrier region on the side of the V-shaped permanent magnet mounting slot adjacent to the d-axis of the V-shaped permanent magnet mounting slot and the rotor core axis is Gs, and the angle between the second magnetic barrier region on the side of the V-shaped permanent magnet mounting slot adjacent to the d-axis of the V-shaped permanent magnet mounting slot and the rotor core axis is Kn, then Gs and Kn satisfy: 0.80Kn>Gs>0.62Kn.

[0012] As one preferred embodiment, the outer edge of the rotor core is provided with a cutting edge structure at the position corresponding to the q-axis of the V-shaped permanent magnet mounting slot;

[0013] Assuming the angle between the two ends of the cut edge structure and the rotor core axis is Tw, and the angle between the second magnetic barrier region on the adjacent V-shaped permanent magnet mounting slots on the side of the V-shaped permanent magnet mounting slot d axis and the rotor core axis is Kn, then Tw and Kn satisfy: Tw > Kn.

[0014] As one preferred embodiment, the side of the second magnetic barrier region adjacent to the outer diameter of the rotor core is parallel to the tangent structure, and the distance between the second magnetic barrier region and the tangent structure is ≤0.01mm.

[0015] As one preferred embodiment, the distance between the side of the first magnetic barrier region adjacent to the outer diameter of the rotor core and the minimum outer diameter of the rotor core is ≥0.4mm.

[0016] As one preferred embodiment, the V-shaped opening of the V-shaped permanent magnet mounting groove faces the outer diameter of the rotor core and includes a first side groove and a second side groove symmetrically arranged; and the magnetic barrier groove is symmetrically distributed on the ends of the first side groove and the second side groove.

[0017] As one preferred embodiment, both the first side groove and the second side groove are right-angled trapezoidal groove structures, and the magnetic barrier groove is connected to the right-angled waist of the right-angled trapezoidal groove structure.

[0018] As one preferred embodiment, the number of V-shaped permanent magnet mounting slots is 8-10.

[0019] As one preferred embodiment, the motor rotor further includes a first magnetic isolation hole and a second magnetic isolation hole symmetrically disposed on both sides of the d-axis of the V-shaped permanent magnet mounting groove, located between the V-shaped permanent magnet mounting groove and the outer edge of the rotor core.

[0020] As one preferred embodiment, the motor rotor further includes a plurality of internal holes and a plurality of refrigerant channels evenly arranged in the circumferential direction of the rotor core, and the distance between the internal holes and the axis of the rotor core is greater than the distance between the refrigerant channels and the axis of the rotor core.

[0021] The internal holes are symmetrically arranged on both sides of any q-axis of the V-shaped permanent magnet mounting groove, and the refrigerant channels are symmetrically arranged on both sides of any q-axis or any d-axis of the V-shaped permanent magnet mounting groove.

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

[0023] The motor rotor provided by this utility model optimizes the overall structure of the motor rotor by adding a magnetic barrier groove at the end of the V-shaped permanent magnet mounting groove. This allows the motor rotor to be used in permanent magnet synchronous motors and compressors, effectively improving the electromagnetic excitation force and optimizing the corresponding frequency band electromagnetic force while ensuring electromagnetic torque, thereby effectively reducing the vibration and noise of the compressor. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the motor rotor 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 2 Enlarged diagram of part B.

[0027] Figure label:

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

[0029] 20. V-shaped permanent magnet mounting groove; 21. First side groove; 22. Second side groove;

[0030] 30. Magnetic barrier groove; 31. First magnetic barrier zone; 32. Second magnetic barrier zone;

[0031] 41. First magnetic isolation hole; 42. Second magnetic isolation hole;

[0032] 50. Internal hole;

[0033] 60. Refrigerant passage. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] Example 1:

[0037] Please see the appendix Figure 1-3 The motor rotor of this embodiment includes a rotor core 10, a plurality of V-shaped permanent magnet mounting slots 20 evenly distributed around the axis of the rotor core 10 for mounting permanent magnets, and magnetic barrier slots 30 symmetrically arranged at the V-shaped opening ends of the V-shaped permanent magnet mounting slots 20; and the magnetic barrier slots 30 include a first magnetic barrier region 31 connected to the V-shaped opening end of the V-shaped permanent magnet mounting slot 20, and a second magnetic barrier region 32 connected to the end of the first magnetic barrier region 31 away from the V-shaped permanent magnet mounting slot 20. Preferably, the rotor core 10 is composed of a plurality of shaft hole cores stacked together, and the number of V-shaped permanent magnet mounting slots 20 is 8-10.

[0038] Please see the appendix Figure 1-3 The V-shaped opening of the V-shaped permanent magnet mounting groove 20 faces the outer diameter of the rotor core 10, and includes a first side groove 21 and a second side groove 22 symmetrically arranged. To further optimize the overall structure of the motor rotor, magnetic barrier grooves 30 are symmetrically arranged at the ends of the first side groove 21 and the second side groove 22. Preferably, the first side groove 21 and the second side groove 22 are both right-angled trapezoidal groove structures, and the oblique waists of the right-angled trapezoidal groove structures of the first side groove 21 and the second side groove 22 are connected. The magnetic barrier groove 30 is connected to the right-angled waist of the right-angled trapezoidal groove structure. That is, the first magnetic barrier area 31 is connected to one end of the right-angled waist of the right-angled trapezoidal groove structure, and the second magnetic barrier area 32 is connected to the end of the first magnetic barrier area 31 away from the right-angled waist of the right-angled trapezoidal groove structure.

[0039] Please see the appendix Figure 1-3Assuming the angle between the first magnetic barrier region 31 on the adjacent V-shaped permanent magnet mounting slot 20, near the d-axis side of the V-shaped permanent magnet mounting slot 20, and the axis of the rotor core 10, is Gs, and the angle between the second magnetic barrier region 32 on the adjacent V-shaped permanent magnet mounting slot 20, near the d-axis side of the V-shaped permanent magnet mounting slot 20, and the axis of the rotor core 10, is Kn, then Gs and Kn satisfy: 0.80Kn>Gs>0.62Kn. The optimized structure of the V-shaped permanent magnet mounting slot 20 and the magnetic barrier slot 30 can effectively improve the electromagnetic excitation force of the motor rotor and optimize the corresponding frequency band electromagnetic force, thereby achieving low noise and low vibration effects, which can be applied to compressors to reduce compressor vibration and noise.

[0040] In this embodiment, the motor rotor optimizes the overall structure by adding a magnetic barrier groove 30 at the end of the V-shaped permanent magnet mounting groove 20. This allows the motor rotor to be used in permanent magnet synchronous motors and compressors, ensuring electromagnetic torque while effectively improving electromagnetic excitation force and optimizing the corresponding frequency band electromagnetic force, thereby effectively reducing compressor vibration and noise.

[0041] Example 2:

[0042] Please see the appendix Figure 1-3 The motor rotor of this embodiment is the same as that of Embodiment 1, both including a rotor core 10, a plurality of V-shaped permanent magnet mounting slots 20 evenly distributed around the axis of the rotor core 10 for mounting permanent magnets, and magnetic barrier slots 30 symmetrically arranged at the V-shaped opening ends of the V-shaped permanent magnet mounting slots 20; and the magnetic barrier slots 30 include a first magnetic barrier region 31 connected to the V-shaped opening end of the V-shaped permanent magnet mounting slot 20, and a second magnetic barrier region 32 connected to the end of the first magnetic barrier region 31 away from the V-shaped permanent magnet mounting slot 20. The main difference is:

[0043] A tangent structure 11 is provided at the position of the outer edge of the rotor core 10 corresponding to the q-axis of the V-shaped permanent magnet mounting groove 20. Further, assuming that the included angle between the two ends of the tangent structure 11 and the axis of the rotor core 10 is Tw, and the included angle between the second magnetic barrier region 32 on the side of the V-shaped permanent magnet mounting groove 20 adjacent to the d-axis and the axis of the rotor core 10 is Kn, then Tw and Kn satisfy: Tw > Kn. More preferably, the distance between the side of the first magnetic barrier region 31 adjacent to the outer diameter of the rotor core 10 and the minimum outer diameter of the rotor core 10 is ≥0.4mm, and the side of the second magnetic barrier region 32 adjacent to the outer diameter of the rotor core 10 is parallel to the tangent structure 11, and the distance between it and the tangent structure 11 is ≤0.01mm.

[0044] In this embodiment, the structure and positional relationship of the rotor core 10, the first magnetic barrier region 31 and the second magnetic barrier region 32 have been further optimized. This can effectively improve the electromagnetic excitation force of the motor rotor and optimize the corresponding frequency band electromagnetic force, thereby achieving low noise and low vibration effects, which can be applied to compressors to reduce compressor vibration and noise.

[0045] Example 3:

[0046] Please see the appendix Figure 1-3 The 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 permanent magnet mounting slots 20 evenly distributed around the axis of the rotor core 10 for mounting permanent magnets, and magnetic barrier slots 30 symmetrically arranged at the V-shaped opening ends of the V-shaped permanent magnet mounting slots 20; and the magnetic barrier slots 30 include a first magnetic barrier region 31 connected to the V-shaped opening end of the V-shaped permanent magnet mounting slot 20, and a second magnetic barrier region 32 connected to the end of the first magnetic barrier region 31 away from the V-shaped permanent magnet mounting slot 20. The main difference is:

[0047] The motor rotor also includes a first magnetic isolation hole 41 and a second magnetic isolation hole 42 symmetrically arranged on both sides of the d-axis of the V-shaped permanent magnet mounting groove 20, located between the V-shaped permanent magnet mounting groove 20 and the outer edge of the rotor core 10; in order to reduce the magnetic conduction of the permanent magnet to the center of the rotor core 10, thereby ensuring that the main magnetic circuit generated by the permanent magnet conducts magnetically in the prescribed direction.

[0048] In some embodiments, the motor rotor further includes a plurality of internal holes 50 and a plurality of refrigerant channels 60 uniformly arranged in the circumferential direction of the rotor core 10, and the distance between the internal holes 50 and the axis of the rotor core 10 is greater than the distance between the refrigerant channels 60 and the axis of the rotor core 10. The internal holes 50 are mainly used to ensure that the motor rotor has sufficient strength under complex working conditions such as high-speed rotation, so as to ensure the safe and stable operation of the motor; at the same time, they facilitate flaw detection with tools to promptly detect possible defects inside the motor rotor, so as to ensure the product qualification rate. Preferably, the number of internal holes 50 is 1 / 2 of the number of V-shaped permanent magnet mounting slots 20, and the plurality of internal holes 50 are symmetrically arranged on both sides of any q-axis of the V-shaped permanent magnet mounting slots 20; for example, when the number of V-shaped permanent magnet mounting slots 20 is 10, the number of internal holes 50 is 5, and the 5 internal holes 50 are symmetrically arranged on both sides of any q-axis of the V-shaped permanent magnet mounting slots 20.

[0049] The refrigerant channel 60 is mainly used for the flow of refrigerant, which removes the heat generated by the motor rotor during operation to prevent overheating and damage, thus maintaining the motor rotor in optimal operating condition. Preferably, there are 4-6 refrigerant channels 60, and the multiple refrigerant channels 60 are symmetrically arranged on both sides of any q-axis or any d-axis of the V-shaped permanent magnet mounting groove 20; more preferably, the cross-section of the refrigerant channel 60 is a petal-shaped structure.

[0050] In this embodiment, the structure of the rotor core 10 of the motor rotor has been further optimized, which can effectively improve the electromagnetic excitation force of the motor rotor and optimize the corresponding frequency band electromagnetic force, thereby achieving the effect of low noise and low vibration, so as to be applied in the compressor and reduce the vibration and noise of the compressor.

[0051] As can be seen from the technical solutions of the above embodiments, the present invention provides a motor rotor that can be applied to permanent magnet synchronous motors and compressors. While ensuring electromagnetic torque, it effectively improves electromagnetic excitation force and optimizes electromagnetic force in the corresponding frequency band, thereby effectively reducing compressor vibration and noise.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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. An electric machine rotor, characterized in that, The rotor core (10) comprises: a plurality of V-shaped permanent magnet mounting grooves (20) evenly distributed around the axis of the rotor core (10) for mounting permanent magnets; and a magnetic barrier groove (30) symmetrically arranged at the V-shaped opening end of the V-shaped permanent magnet mounting groove (20), comprising a first magnetic barrier area (31) connected to the V-shaped opening end of the V-shaped permanent magnet mounting groove (20), and a second magnetic barrier area (32) connected to the first magnetic barrier area (31) away from one end of the V-shaped permanent magnet mounting groove (20). Suppose the angle between the first magnetic barrier area (31) on the adjacent two V-shaped permanent magnet mounting grooves (20) adjacent to the d-axis side of the V-shaped permanent magnet mounting groove (20) and the axis of the rotor core (10) is Gs, and the angle between the second magnetic barrier area (32) on the adjacent two V-shaped permanent magnet mounting grooves (20) adjacent to the d-axis side of the V-shaped permanent magnet mounting groove (20) and the axis of the rotor core (10) is Kn, then Gs and Kn satisfy: 0.80Kn>Gs>0.62Kn.

2. The electric machine rotor of claim 1, wherein, The rotor core (10) is provided with a cutting edge structure (11) at the position corresponding to the q-axis of the V-shaped permanent magnet mounting groove (20) on the outer edge of the rotor core (10); 3. The motor rotor of claim 1, wherein, Suppose the angle between the two ends of the cutting edge structure (11) and the axis of the rotor core (10) is Tw, and the angle between the second magnetic barrier area (32) on the adjacent two V-shaped permanent magnet mounting grooves (20) adjacent to the d-axis side of the V-shaped permanent magnet mounting groove (20) and the axis of the rotor core (10) is Kn, then Tw and Kn satisfy: Tw>Kn. The side of the second magnetic barrier area (32) adjacent to the outer diameter side of the rotor core (10) is parallel to the cutting edge structure (11), and the distance between them is ≤0.01mm.

4. The motor rotor of claim 3, wherein The side of the first magnetic barrier area (31) adjacent to the outer diameter side of the rotor core (10) is ≥0.4mm away from the minimum outer diameter of the rotor core (10).

5. The motor rotor of claim 1, wherein The V-shaped opening of the V-shaped permanent magnet mounting groove (20) faces the outer diameter side of the rotor core (10), comprising symmetrically arranged first side groove (21) and second side groove (22); and the magnetic barrier groove (30) is symmetrically arranged at the end of the first side groove (21) and the second side groove (22).

6. The motor rotor of claim 1, wherein The first side groove (21) and the second side groove (22) are both right-angled trapezoidal groove structures, and the magnetic barrier groove (30) is connected to the right-angled waist of the right-angled trapezoidal groove structure.

7. The motor rotor of claim 6, wherein The number of V-shaped permanent magnet mounting grooves (20) is 8-10.

8. The motor rotor of claim 1, wherein It also comprises a first magnetic isolation hole (41) and a second magnetic isolation hole (42) symmetrically arranged on the d-axis sides of the V-shaped permanent magnet mounting groove (20) and located between the V-shaped permanent magnet mounting groove (20) and the outer edge of the rotor core (10).

9. The motor rotor of claim 1, wherein, ​ 10. The motor rotor of claim 1, wherein Also included are a plurality of internal holes (50) and a plurality of refrigerant passages (60) uniformly arranged in the circumferential direction of the rotor core (10), and the distance between the internal holes (50) and the axis of the rotor core (10) is greater than the distance between the refrigerant passages (60) and the axis of the rotor core (10); The internal holes (50) are symmetrically arranged on either side of the q-axis of the V-shaped permanent magnet mounting groove (20), and the refrigerant passages (60) are symmetrically arranged on either side of the q-axis or the d-axis of the V-shaped permanent magnet mounting groove (20).

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