High-efficiency rotor and motor

Abstract

The utility model relates to the technical field of compressor motors, and discloses a high-efficiency rotor, which comprises a rotor iron core and a plurality of slotted holes arranged along the circumferential direction of the rotor iron core, each slotted hole comprises a slotted hole upper part and a slotted hole lower part connected with the slotted hole upper part, the slotted hole upper part is close to the outer circumferential surface of the rotor iron core, and the slotted hole lower part is close to the outer circumferential surface of the rotor iron core. The lower parts of the slotted holes are close to the inner circumferential surface of the rotor iron core; the shortest distance between the upper part of the slotted hole and the peripheral surface of the rotor core is L1, and L1 is 0.1-0.5 mm. The technical effects of the utility model are that the magnetic field distribution of the rotor iron core can be changed by adjusting the shortest distance between the upper part of the slotted hole and the peripheral surface of the rotor iron core, thereby reducing the yoke magnetic flux density of the rotor iron core, reducing the input power of the motor, improving the operation efficiency of the motor, improving the maximum torque of the motor, and improving the service life of the motor. And the power performance of the motor is improved. The utility model also discloses a motor.

Description

Technical Field

[0001] This utility model belongs to the field of compressor motor technology, specifically relating to a high-efficiency rotor and motor. Background Technology

[0002] In rotary AC fixed-frequency compressors, squirrel-cage induction motors are commonly used. However, the inability to significantly improve the efficiency and maximum torque of these motors has become a pain point in the industry. In recent years, to improve motor efficiency and maximum torque and provide motors with higher cost-effectiveness, a common practice in the industry is to increase the slot area of ​​the large-cage rotor. While simply increasing the slot area of ​​the large-cage rotor can improve motor efficiency and maximum torque to some extent, it also leads to a decrease in motor torque, resulting in quality issues such as poor starting and affecting the motor's power performance. Furthermore, excessively large slot areas also increase the amount of aluminum cast in the rotor, thereby increasing production costs. Therefore, how to better improve motor efficiency and maximum torque has become crucial. Utility Model Content

[0003] To address the shortcomings of the prior art, this invention provides a high-efficiency rotor. By adjusting the shortest distance between the upper part of the slot and the outer circumferential surface of the rotor core, the magnetic field distribution of the rotor core is altered, reducing the magnetic flux density at the yoke of the rotor core. This reduces the motor input power, improves motor operating efficiency, and simultaneously increases the motor's maximum torque without affecting the motor's torque. This invention also provides a motor.

[0004] The technical effects to be achieved by this utility model are realized through the following technical aspects:

[0005] In a first aspect, the present invention provides a high-efficiency rotor, including a rotor core and a plurality of slots arranged circumferentially along the rotor core. Each slot includes an upper part and a lower part connected to the upper part. The upper part of the slot is close to the outer circumferential surface of the rotor core, and the lower part of the slot is close to the inner circumferential surface of the rotor core.

[0006] The shortest distance between the upper part of the slot and the outer circumference of the rotor core is L1, and L1 is 0.1 to 0.5 mm.

[0007] As a further description of the technical solution of this utility model, the outer diameter of the rotor core is R1, and the high-efficiency rotor has the following relationship: 50≤R1 / L1≤251.

[0008] As a further description of the technical solution of this utility model, the upper part of the slot includes a first arc, a first straight shoulder and a second straight shoulder, the first straight shoulder and the second straight shoulder are respectively connected to the two ends of the first arc, and the first straight shoulder and the second straight shoulder are symmetrically arranged.

[0009] As a further description of the technical solution of this utility model, both the first straight shoulder and the second straight shoulder are located in the tangential direction of the first arc.

[0010] As a further description of the technical solution of this utility model, the lower part of the slot includes a second arc, a first straight edge and a second straight edge, the first straight edge and the second straight edge are respectively connected to the two ends of the second arc, and the first straight edge and the second straight edge are symmetrically arranged.

[0011] The first straight edge is connected to the first straight shoulder, and the second straight edge is connected to the second straight shoulder; the two adjacent slots and the adjacent first straight edges and second straight edges are parallel to each other.

[0012] As a further description of the technical solution of this utility model, the included angle between the first straight shoulder and the first straight edge is A1, and the high-efficiency rotor has the following relationship: 120°≤A1≤150°.

[0013] As a further description of the technical solution of this utility model, the length of the first straight side is L2, the length of the first straight shoulder is L3, and the high-efficiency rotor has the relationship: 5≤L2 / L3≤6.5.

[0014] As a further description of the technical solution of this utility model, the outer diameter of the rotor core is R1, the radius of the first arc is R2, and the high-efficiency rotor has the following relationship: 16≤R1 / R2≤27.

[0015] Secondly, this utility model provides an electric motor, including a stator and the high-efficiency rotor, wherein the high-efficiency rotor is disposed within the stator.

[0016] As a further description of the technical solution of this utility model, the stator includes a stator core and a plurality of through slots arranged circumferentially along the stator core, and the through slots have an opening on the side near the high-efficiency rotor.

[0017] In summary, this utility model has at least the following advantages:

[0018] The high-efficiency rotor provided by this utility model can change the magnetic field distribution of the rotor core by adjusting the shortest distance between the upper part of the slot and the outer peripheral surface of the rotor core, thereby reducing the magnetic flux density of the yoke of the rotor core, which in turn reduces the input power of the motor and improves the operating efficiency of the motor. At the same time, it can also increase the maximum torque of the motor without affecting the motor torque, which is beneficial to improving the power performance of the motor.

[0019] The motor provided by this utility model effectively reduces the input power of the motor and improves the operating efficiency of the motor due to the high-efficiency rotor. At the same time, the maximum torque of the motor is also increased, thereby improving the power performance of the motor. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the cross-sectional structure of the high-efficiency rotor in Embodiment 1 of this utility model;

[0021] Figure 2 This is a schematic diagram of the slot structure in Embodiment 1 of this utility model;

[0022] Figure 3 for Figure 1 Enlarged view of section A;

[0023] Figure 4 This is a diagram showing the correspondence between L1 and the magnetic flux density of the rotor core yoke in Embodiment 1 of this utility model.

[0024] Figure 5 This is a diagram showing the correspondence between L1 and motor input power in Embodiment 1 of this utility model;

[0025] Figure 6 This is a diagram showing the relationship between L1 and motor efficiency in Embodiment 1 of this utility model;

[0026] Figure 7 This is a diagram showing the correspondence between L1 and the maximum torque of the motor in Embodiment 1 of this utility model;

[0027] Figure 8 This is a schematic diagram of the slot structure in Embodiment 2 of this utility model;

[0028] Figure 9 This is a schematic diagram of the cross-sectional structure of the motor in Embodiment 3 of this utility model.

[0029] Marked in the image:

[0030] 1. Rotor core;

[0031] 2. Slot; 21. Upper part of slot; 211. First arc; 212. First straight shoulder; 213. Second straight shoulder; 22. Lower part of slot; 221. Second arc; 222. First straight edge; 223. Second straight edge;

[0032] 100. Stator; 101. Stator core; 102. Through slot; 103. Opening; 200. High-efficiency rotor. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] Example 1

[0036] refer to Figures 1 to 7 The high-efficiency rotor provided in this embodiment includes a rotor core 1 and a plurality of slots 2 arranged circumferentially along the rotor core 1. The slots 2 are evenly spaced and angularly distributed, and are used to accommodate aluminum strips. In some embodiments, aluminum strips are formed by directly pouring molten aluminum into the slots 2.

[0037] The slot 2 includes an upper slot 21 and a lower slot 22 connected to the upper slot 21. The upper slot 21 is close to the outer circumferential surface of the rotor core 1, and the lower slot 22 is close to the inner circumferential surface of the rotor core 1. The shortest distance between the upper slot 21 and the outer circumferential surface of the rotor core 1 is L1, which is 0.1 to 0.5 mm in this embodiment. Setting L1 to 0.1 to 0.5 mm can significantly change the magnetic field distribution of the rotor core 1, thereby reducing the magnetic flux density of the yoke of the rotor core 1, thus reducing the motor input power and improving the motor efficiency. At the same time, it can also increase the maximum torque of the motor without affecting the motor torque, which is beneficial to improving the power performance of the motor.

[0038] like Figures 4 to 7 As shown, within the range of 0.1–0.5 mm for L1, as L1 gradually decreases, the magnetic flux density of the yoke of rotor core 1 and the motor input power both gradually decrease, while the motor efficiency and the maximum torque of the motor gradually increase. Therefore, the optimal value for L1 within the 0.1–0.5 mm range is 0.1 mm. This also proves that reducing L1 is more beneficial for improving motor efficiency and maximum torque, thus enhancing the motor's dynamic performance.

[0039] In some embodiments, the outer diameter of the rotor core 1 is R1, and the high-efficiency rotor has the relationship: 50≤R1 / L1≤251. By setting the ratio of R1 to L1, the operating efficiency and maximum torque of the motor can be optimized, while ensuring the mechanical strength of the rotor core 1, which is beneficial to extending the service life of the rotor.

[0040] The high-efficiency rotor of this embodiment can change the magnetic field distribution of the rotor core by adjusting the shortest distance between the upper part of the slot and the outer peripheral surface of the rotor core, thereby reducing the magnetic flux density of the yoke of the rotor core, which in turn reduces the input power of the motor and improves the operating efficiency of the motor. At the same time, it can also increase the maximum torque of the motor without affecting the motor torque, which is beneficial to improving the power performance of the motor. By adjusting the ratio of R1 to L1, the operating efficiency and maximum torque of the motor can be optimized, while ensuring the mechanical strength of the rotor core, which is beneficial to extending the service life of the rotor.

[0041] Example 2

[0042] As a further optimization of Example 1, refer to Figure 8 The upper part 21 of the slot includes a first arc 211, a first straight shoulder 212 and a second straight shoulder 213. The first straight shoulder 212 and the second straight shoulder 213 are respectively connected to the opposite ends of the first arc 211, and the first straight shoulder 212 and the second straight shoulder 213 are symmetrically arranged.

[0043] As a further optimization, both the first straight shoulder 212 and the second straight shoulder 213 are located on the tangent direction of the first arc 211. This ensures that the connection between the first straight shoulder 212, the first arc 211, and the second straight shoulder 213 will not produce sharp corners. On the one hand, this reduces the stamping difficulty of forming the slot 2, reduces the wear of the die punch, extends the service life of the die punch, and reduces production and maintenance costs. On the other hand, it avoids incomplete or insufficient casting of aluminum liquid due to the presence of sharp corners, thereby improving the product qualification rate.

[0044] The lower part 22 of the slot includes a second arc 221, a first straight edge 222, and a second straight edge 223. The first straight edge 222 and the second straight edge 223 are respectively connected to opposite ends of the second arc 221, and the first straight edge 222 and the second straight edge 223 are symmetrically arranged. The first straight edge 222 is connected to the first straight shoulder 212, and the second straight edge 223 is connected to the second straight shoulder 213. Adjacent slots 2 and adjacent first straight edges 222 and second straight edges 223 are parallel to each other.

[0045] In some embodiments, the first straight edge 222 and the second straight edge 223 can also be located in the tangent direction of the second arc 221, which can reduce the stamping difficulty of the slot 2, reduce the wear of the mold punch, extend the service life of the mold punch, and at the same time ensure the sufficiency of aluminum liquid casting.

[0046] In this embodiment, the included angle between the first straight shoulder 212 and the first straight side 222 is A1. The high-efficiency rotor has the relationship: 120°≤A1≤150°. Setting A1 as an obtuse angle can avoid insufficient aluminum casting due to an angle that is too small, which is beneficial to improving the production quality of the product and ensuring its normal performance. It should be noted that the included angle between the second straight shoulder 213 and the second straight side 223 is also the same as A1.

[0047] In this embodiment, the length of the first straight side 222 is L2, and the length of the first straight shoulder 212 is L3. The high-efficiency rotor has the relationship: 5 ≤ L2 / L3 ≤ 6.5. By setting the ratio of L2 to L3, it is possible to ensure that the yoke of the rotor core 1 has sufficient area, thereby reducing the magnetic flux density of the yoke of the rotor core 1, which is beneficial to improving the performance of the motor. It should be noted that the ratio of the second straight side 223 to the second straight shoulder 213 is also the same as the ratio of the first straight side 222 to the first straight shoulder 212.

[0048] In this embodiment, the outer diameter of the rotor core 1 is R1, and the radius of the first arc 211 is R2. The high-efficiency rotor has the relationship: 16≤R1 / R2≤27. By setting the ratio of R1 to R2, it is ensured that the slot 2 has sufficient area, which is more conducive to improving motor efficiency and maximum motor torque. At the same time, it also helps to reduce the stamping difficulty of the slot 2 and ensures the sufficiency of aluminum liquid casting.

[0049] The high-efficiency rotor of this embodiment, by setting the first and second straight shoulders in the tangential direction of the first arc, can reduce the stamping difficulty of the slots, reduce the wear of the die punch, and improve the fullness of aluminum molten casting, thereby increasing the product qualification rate. By setting the included angle between the first straight shoulder and the first straight side to an obtuse angle, the fullness of aluminum molten casting can be further improved, which is conducive to improving product production quality and ensuring the normal performance of the product. By adjusting the ratio of L2 to L3, the yoke of the rotor core is ensured to have sufficient area, thereby reducing the magnetic flux density of the yoke of the rotor core and improving the performance of the motor. By adjusting the ratio of R1 to R2, the motor efficiency and maximum torque can be further improved, while also reducing the stamping difficulty of the slots and ensuring the fullness of aluminum molten casting.

[0050] Example 3

[0051] refer to Figure 9The motor provided in this embodiment includes a stator 100 and a high-efficiency rotor 200 of embodiment 1 or 2, wherein the high-efficiency rotor 200 is disposed within the stator 100. The stator 100 includes a stator core 101 and a plurality of through slots 102 disposed circumferentially along the stator core 101, wherein the plurality of through slots 102 are distributed at equal intervals and at equal angles.

[0052] In some embodiments, the through slot 102 has an opening 103 on the side near the high-efficiency rotor 200, and slot shoulders are formed on both sides of the opening 103 within the through slot 102. By providing the opening 103 in the through slot 102, the magnetic resistance of leakage flux can be increased, thereby reducing leakage flux and improving the efficiency of the motor. In addition, providing the opening 103 also facilitates the embedding of wires into the through slot 102, which helps to simplify the motor assembly process and improve the motor assembly efficiency.

[0053] The motor in this embodiment, due to the high-efficiency rotor, effectively reduces the input power of the motor and improves the operating efficiency of the motor. At the same time, the maximum torque of the motor is also increased, thereby improving the power performance of the motor. By opening an opening on the side of the through slot near the high-efficiency rotor, the magnetic resistance of leakage flux can be increased, the leakage flux can be reduced, and the motor efficiency can be improved. At the same time, it is also beneficial to simplify the motor assembly process and improve the motor assembly efficiency.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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 high efficiency rotor characterized by, The rotor core (1) and a plurality of slot holes (2) arranged along the circumference of the rotor core (1), the slot hole (2) comprising a slot hole upper portion (21) and a slot hole lower portion (22) connected with the slot hole upper portion (21), the slot hole upper portion (21) being close to the outer circumferential surface of the rotor core (1), and the slot hole lower portion (22) being close to the inner circumferential surface of the rotor core (1); The shortest distance between the slot hole upper portion (21) and the outer circumferential surface of the rotor core (1) is L1, and the L1 is 0.1-0.5 mm.

2. The high efficiency rotor of claim 1, wherein The outer diameter of the rotor core (1) is R1, and the high-efficiency rotor has a relationship: 50≤R1 / L1≤251.

3. The high efficiency rotor of claim 1 wherein, The slot hole upper portion (21) comprises a first circular arc (211), a first straight shoulder (212) and a second straight shoulder (213), the first straight shoulder (212) and the second straight shoulder (213) are respectively connected to both ends of the first circular arc (211), and the first straight shoulder (212) and the second straight shoulder (213) are symmetrically arranged.

4. The high efficiency rotor of claim 3 wherein, The first straight shoulder (212) and the second straight shoulder (213) are located in the tangent direction of the first circular arc (211).

5. The high efficiency rotor of claim 3 wherein, The slot hole lower portion (22) comprises a second circular arc (221), a first straight edge (222) and a second straight edge (223), the first straight edge (222) and the second straight edge (223) are respectively connected to both ends of the second circular arc (221), and the first straight edge (222) and the second straight edge (223) are symmetrically arranged. The first straight edge (222) is connected with the first straight shoulder (212), and the second straight edge (223) is connected with the second straight shoulder (213); the first straight edge (222) and the second straight edge (223) of adjacent slot holes (2) are parallel to each other.

6. The high efficiency rotor of claim 5 wherein, The included angle between the first straight shoulder (212) and the first straight edge (222) is A1, and the high-efficiency rotor has a relationship: 120°≤A1≤150°.

7. The high efficiency rotor of claim 5 wherein, The length of the first straight edge (222) is L2, and the length of the first straight shoulder (212) is L3, and the high-efficiency rotor has a relationship: 5≤L2 / L3≤6.

5.

8. The high efficiency rotor of claim 3 wherein, The outer diameter of the rotor core (1) is R1, and the radius of the first circular arc (211) is R2, and the high-efficiency rotor has a relationship: 16≤R1 / R2≤27.

9. An electric machine characterized by The high-efficiency rotor (200) according to any one of claims 1-8 is arranged in the stator (100).

10. The electric machine of claim 9, wherein, The stator (100) comprises a stator core (101) and a plurality of through slots (102) arranged along the circumference of the stator core (101), and the through slot (102) is provided with an opening (103) on the side close to the high-efficiency rotor (200).

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