Rotor assembly, motor, compressor and refrigeration equipment

Abstract

The utility model discloses a rotor assembly, a motor, a compressor and refrigeration equipment, the rotor assembly comprises a rotor iron core, the rotor iron core comprises 2p rotor units arranged along the circumferential direction of the rotor iron core, a magnetic steel groove is defined between two adjacent rotor units, and the outer diameter of the rotor iron core is D1; the number of the magnetic steels is 2p, the 2p magnetic steels are respectively arranged in the 2p magnetic steel grooves, the radial length of each magnetic steel is Lpm, the tangential length of each magnetic steel is Hpm, the minimum distance between the radial inner end faces of two opposite magnetic steels along the radial direction of the rotor iron core is D2, and D1, D2, p, Lpm and Hpm satisfy the following formula: theta 2 = theta 3-theta 1. The motor efficiency is improved, the anti-demagnetization capability is improved, and the stability of the motor is improved. Meanwhile, the tangential length of the magnetic steel is large, the radial length of the magnetic steel can be reduced when the magnetic requirement is met, the radial length and the tangential length of the rotor iron core are reduced, and therefore the electromagnetic cost is reduced.

Description

Technical Field

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

[0002] Traditional tangential permanent magnet motors have short tangential dimensions and long radial dimensions for their magnet bearings. Due to rotor structure limitations, the amount of permanent magnets used is relatively small, resulting in lower magnetic field energy density and ultimately lower efficiency. Furthermore, the short tangential dimension of the magnet bearings cannot provide sufficient anti-demagnetizing magnetomotive force, making the permanent magnets prone to demagnetization under high current, thus damaging the performance of both the permanent magnets and the motor. Moreover, the short tangential and long radial dimensions of the magnet bearings increase the radial and tangential lengths of the rotor lamination units, reducing material utilization and increasing manufacturing costs. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a rotor assembly that improves motor efficiency, enhances anti-demagnetization capability, improves motor stability, and reduces electromagnetic costs.

[0004] This utility model also proposes an electric motor, including the rotor assembly described above.

[0005] This utility model also proposes a compressor, including the aforementioned motor.

[0006] This utility model also proposes a refrigeration device, including the compressor described above.

[0007] A rotor assembly according to an embodiment of the present invention includes: a rotor core, the rotor core comprising 2p rotor units arranged along the circumferential direction of the rotor core, a magnet slot defining a space between two adjacent rotor units, the outer diameter of the rotor core being D1; and magnets, comprising 2p magnets respectively disposed within the 2p magnet slots, the radial length of the magnet being Lpm, the tangential length of the magnet being Hpm, and the minimum distance between the radial inner end face of the magnet and the axis of the rotor core being D2 / 2, wherein D1, D2, p, Lpm, and Hpm satisfy the following: Wherein, θ2 = θ3 - θ1, the The

[0008] According to an embodiment of the present invention, the rotor assembly includes 2p rotor units arranged circumferentially along the rotor core, with magnetic slots defined between adjacent rotor units. The outer diameter of the rotor core is D1. There are 2p magnets, each disposed within one of the 2p magnetic slots. The radial length of each magnet is Lpm, and the tangential length is Hpm. The minimum distance between the radial inner end face of the magnet and the axis of the rotor core is D2 / 2. D1, D2, p, Lpm, and Hpm satisfy the following: This allows for a smaller value for K, resulting in a larger HPm, which increases magnetic field energy density, motor efficiency, demagnetization resistance, and motor stability. Simultaneously, a larger tangential length of the magnet allows for a reduction in the radial length of the magnet, as well as the radial and tangential lengths of the rotor core, while still meeting magnetic requirements, thereby lowering electromagnetic costs.

[0009] In some embodiments of this utility model, D1 and Hpm satisfy: And / or, the Lpm and the HPm satisfy:

[0010] In some embodiments of this utility model, the maximum dimension of the rotor unit is W2 in a direction perpendicular to the centerline of the rotor unit and the axial direction of the rotor core, wherein W2 and HPm satisfy:

[0011]

[0012] In some embodiments of this utility model, the rotor assembly further includes: an inner rotor core, the inner rotor core being located radially inside the rotor core, the inner rotor core having a shaft hole, and the outer peripheral wall of the inner rotor core having a groove, the groove being multiple, the multiple grooves being spaced apart along the circumferential direction of the inner rotor core, and the grooves penetrating the inner rotor core along the axial direction of the inner rotor core.

[0013] In some embodiments of this utility model, the maximum distance between the outer peripheral wall of the inner rotor core and the axis of the inner rotor core is D4 / 2, wherein D1 and D4 satisfy: And / or, the maximum distance between the outer peripheral wall of the inner rotor core and the axis of the inner rotor core is D4 / 2, and the minimum distance between the inner peripheral wall of the inner rotor core and the axis of the inner rotor core is D5 / 2, wherein D4 and D5 satisfy:

[0014] The motor according to an embodiment of the present invention includes: a stator, the stator including a stator core, the stator core including a yoke and a plurality of teeth, the plurality of teeth being disposed on the inner peripheral wall of the yoke and spaced apart along the circumferential direction of the yoke, and a stator slot being defined between two adjacent teeth; and the aforementioned rotor assembly, the rotor assembly being rotatably disposed within the stator core.

[0015] According to the embodiment of the present invention, the motor, by setting the above-mentioned rotor assembly, includes 2p rotor units arranged along the circumferential direction of the rotor core, with a magnet slot defined between two adjacent rotor units. The outer diameter of the rotor core is D1; ​​there are 2p magnets, each disposed in one of the 2p magnet slots. The radial length of the magnet is Lpm, the tangential length of the magnet is Hpm, and the minimum distance between the radial inner end face of the magnet and the axis of the rotor core is D2 / 2. D1, D2, p, Lpm, and Hpm satisfy the following: This allows for a smaller value for K, resulting in a larger HPm, which increases magnetic field energy density, motor efficiency, demagnetization resistance, and motor stability. Simultaneously, a larger tangential length of the magnet allows for a reduction in the radial length of the magnet, as well as the radial and tangential lengths of the rotor core, while still meeting magnetic requirements, thereby lowering electromagnetic costs.

[0016] In some embodiments of this utility model, the minimum distance between the radial inner end of the tooth and the stator core axis in the projection onto a plane perpendicular to the stator core axis is D3 / 2, where D3 and Hpm satisfy:

[0017]

[0018] In some embodiments of this utility model, the 2p satisfies: 2≤2p≤30; and / or, the number of stator slots is 3-30.

[0019] The compressor according to an embodiment of the present invention includes the motor described above.

[0020] According to the compressor of this utility model embodiment, by setting the above-mentioned motor and rotor assembly, the rotor core includes 2p rotor units arranged along the circumferential direction of the rotor core, and a magnet slot is defined between two adjacent rotor units. The outer diameter of the rotor core is D1; ​​there are 2p magnets, each of which is disposed in one of the 2p magnet slots. The radial length of the magnet is Lpm, the tangential length of the magnet is Hpm, and the minimum distance between the radial inner end face of the magnet and the axis of the rotor core is D2 / 2. D1, D2, p, Lpm, and Hpm satisfy the following: This allows for a smaller value for K, resulting in a larger HPm, which increases magnetic field energy density, motor efficiency, demagnetization resistance, and motor stability. Simultaneously, a larger tangential length of the magnet allows for a reduction in the radial length of the magnet, as well as the radial and tangential lengths of the rotor core, while still meeting magnetic requirements, thereby lowering electromagnetic costs.

[0021] The refrigeration equipment according to an embodiment of the present invention includes the compressor described above.

[0022] According to the refrigeration equipment of this utility model embodiment, by setting the above-mentioned compressor, motor, and rotor assembly, the rotor core includes 2p rotor units arranged along the circumferential direction of the rotor core, with magnetic slots defined between adjacent rotor units. The outer diameter of the rotor core is D1; ​​there are 2p magnets, each disposed in one of the 2p magnetic slots. The radial length of the magnet is Lpm, the tangential length of the magnet is Hpm, and the minimum distance between the radial inner end face of the magnet and the axis of the rotor core is D2 / 2. D1, D2, p, Lpm, and Hpm satisfy the following: This allows for a smaller value for K, resulting in a larger HPm, which increases magnetic field energy density, motor efficiency, demagnetization resistance, and motor stability. Simultaneously, a larger tangential length of the magnet allows for a reduction in the radial length of the magnet, as well as the radial and tangential lengths of the rotor core, while still meeting magnetic requirements, thereby lowering electromagnetic costs.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a cross-sectional view of a motor according to an embodiment of the present utility model;

[0026] Figure 2 This is a cross-sectional view of a rotor assembly according to an embodiment of the present utility model;

[0027] Figure 3 This is a partial cross-sectional view of a rotor assembly according to an embodiment of the present utility model;

[0028] Figure 4 This is a cross-sectional view of the inner rotor core of the rotor assembly according to an embodiment of the present utility model;

[0029] Figure 5 This is a graph showing the relationship between the efficiency of the motor and the K value according to an embodiment of the present invention;

[0030] Figure 6 This is a graph showing the relationship between the per-unit value of the back EMF of the motor and the K value according to an embodiment of the present invention;

[0031] Figure 7 This is a comparison diagram of the relationship between the per-unit values ​​of motor torque and current of the motor according to the embodiment of the present invention and the per-unit values ​​of motor torque and current of the conventional scheme. In this scheme, K is 1.46, and in the conventional scheme, K is 1.8.

[0032] Figure 8 This is a comparison diagram of the demagnetizing current of the motor according to the embodiment of the present invention and the demagnetizing current of the motor according to the conventional solution, wherein K is 1.46 in the present solution and K is 1.8 in the conventional solution;

[0033] Figure 9 This is a comparison diagram of the per-unit value of the line back EMF of the motor according to the embodiment of this utility model and the line back EMF of the motor according to the conventional solution, wherein K is 1.46 in this solution and K is 1.8 in the conventional solution;

[0034] Figure 10 This is a comparison chart of the electromagnetic cost of the motor according to the embodiment of the present invention and the electromagnetic cost of the motor according to the conventional solution, wherein K is 1.46 in the present solution and K is 1.8 in the conventional solution.

[0035] Figure label:

[0036] 100. Electric motor;

[0037] 10. Rotor assembly;

[0038] 1. Rotor core; 11. Rotor unit; 12. Magnet slot; 13. Magnet;

[0039] 2. Inner rotor core; 21. Groove;

[0040] 20. Stator; 201. Stator core; 202. Tooth section; 203. Yoke section; 204. Stator slot. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0042] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] The following is for reference. Figures 1-10 The rotor assembly 10 according to an embodiment of the present invention is described.

[0045] like Figures 1-10 As shown, the rotor assembly 10 according to an embodiment of the present invention includes: a rotor core 1 and a magnet 13.

[0046] Specifically, such as Figures 1-2 As shown, the rotor core 1 includes 2p rotor units 11 arranged along the circumferential direction of the rotor core 1. Magnet slots 12 are defined between adjacent rotor units 11. The outer diameter of the rotor core 1 is D1. There are 2p magnets 13, each disposed within one of the 2p magnet slots 12. The radial length of each magnet 13 is Lpm, and the tangential length is Hpm. The minimum distance between the radial inner end face of each magnet 13 and the axis of the rotor core 1 is D2 / 2. D1, D2, p, Lpm, and Hpm satisfy the following conditions: Where θ2 = θ3 - θ1, It should be noted that K can be 1.2, 1.3, 1.4 or 1.6, etc. The units for D1, D2, p, Lpm and HPm are consistent. For example, in this utility model, the units of D1, D2, p, Lpm and HPm are all mm. However, this utility model is not limited to this. The units of D1, D2, p, Lpm and HPm can also be other, such as nm, m, km, etc.

[0047] Understandably, since both magnet 13 and rotor unit 11 are 2p, Through formula The distance of the straight line segment S1 can be calculated, which is the distance between the vertices of the radial outer ends of any two adjacent magnets 13 facing each other. Therefore, by designing the ratio K of the distance between the vertices of the radial outer ends of any two adjacent magnets 13 facing each other to the tangential length of the magnet 13, the tangential length of the magnet 13 can be adjusted. At the same time, since K is the ratio of the distance between the vertices of the radial outer ends of any two adjacent magnets 13 facing each other to the tangential length of the magnet 13, that is, the circumference of the rotor core 1 is fixed, increasing or decreasing the tangential length of the magnet 13 will not affect the change in the circumference of the rotor core 1.

[0048] A larger K value results in a smaller HPm and a smaller tangential length of magnet 13, while a smaller K value results in a larger HPm and a larger tangential length of magnet 13. A smaller K value leads to a larger tangential length of magnet 13, which can increase the magnetic field energy density, improve the efficiency of motor 100, enhance demagnetization resistance, and improve the stability of motor 100. Simultaneously, a larger tangential length of magnet 13, while meeting magnetic requirements, allows for a reduction in the radial length of magnet 13, as well as the radial and tangential lengths of rotor core 1, thereby reducing electromagnetic costs.

[0049] Furthermore, when the value of K is too small, i.e., when Hpm is too large, the excessive width of magnet 13 may increase magnetic leakage, meaning that some magnetic flux does not pass through the air gap but instead forms a short circuit through adjacent magnetic poles or external paths. This will reduce the effective utilization rate of magnet 13 and affect the performance of motor 100.

[0050] therefore, On the one hand, a smaller value for K results in a larger value for HPm, which increases the magnetic field energy density, improves the efficiency of motor 100, enhances its resistance to demagnetization, and improves its stability. Simultaneously, a larger tangential length for magnet 13 allows for a reduction in the radial length of magnet 13, thus reducing the radial and tangential lengths of rotor core 1 and lowering electromagnetic costs while still meeting magnetic requirements. On the other hand, an excessively small value for K can be avoided, preventing excessively large HPm that could negatively impact motor 100 performance.

[0051] For example in Figure 5 and Figure 6As shown in the graph, when K is between 1 and 1.4, the per-unit efficiency and back EMF (reflecting the efficiency and power density of the motor) gradually increase. When K is between 1.4 and 1.8, the per-unit efficiency and back EMF gradually decrease. Therefore, when K is between 1.2 and 1.6, the per-unit efficiency and back EMF can be at a relatively high level, thus improving the efficiency of the motor.

[0052] The advantages of the rotor assembly 10 in this embodiment of the present invention are illustrated below by comparing it with the rotor assembly 10 in the conventional solution (control group). The K value of the rotor assembly 10 in this embodiment of the present invention is 1.46, while the K value of the rotor assembly 10 in the conventional solution is 1.8.

[0053] 1. Torque advantage: such as Figure 7 As shown, when the per-unit current value is 0.3A-1A, under the same per-unit current value, the torque of the motor 100 in this embodiment of the present invention is greater than the torque of the motor 100 in the conventional solution.

[0054] 2. Advantages in resistance to demagnetization: such as Figure 8 As shown, the per-unit value of the demagnetizing current of the motor 100 in this embodiment of the present invention is 60% higher than that of the traditional solution. The higher the per-unit value of the demagnetizing current, the stronger the anti-demagnetizing ability.

[0055] 3. Advantages of 100% motor efficiency: such as Figure 9 As shown, the per-unit value of the back line EMF of the motor 100 in this embodiment of the present invention is 32% higher than that of the traditional scheme. The higher the per-unit value of the back line EMF, the higher the efficiency of the motor 100.

[0056] 4. The advantages of electromagnetic cost, such as Figure 10 As shown, the electromagnetic cost of this embodiment is reduced by 25% compared to the electromagnetic cost of the traditional solution.

[0057] According to the embodiment of the present invention, the rotor assembly 10 includes a rotor core 1 comprising 2p rotor units 11 arranged along the circumferential direction of the rotor core 1, with magnetic slots 12 defined between adjacent rotor units 11. The outer diameter of the rotor core 1 is D1. There are 2p magnets 13, each disposed within one of the 2p magnetic slots 12. The radial length of each magnet 13 is Lpm, the tangential length is Hpm, and the minimum distance between the radial inner end face of the magnet 13 and the axis of the rotor core 1 is D2 / 2. D1, D2, p, Lpm, and Hpm satisfy the following: This allows for a smaller value for K, resulting in a larger HPm, which increases the magnetic field energy density, improves the efficiency of motor 100, enhances its resistance to demagnetization, and improves its stability. Simultaneously, a larger tangential length for magnet 13 allows for a reduction in the radial length of magnet 13, as well as the radial and tangential lengths of rotor core 1, while still meeting magnetic requirements, thereby reducing electromagnetic costs.

[0058] In some embodiments of this utility model, D1 and Hpm satisfy: For example It can be 2, 2.5, 3 or 4. It should be noted that 100 in the formula is the magnification ratio coefficient, which is used to amplify the ratio of π×D1 and Hpm.

[0059] It is understandable that π×D1 is the circumference of rotor core 1, and the ratio of Hpm to π×D1 represents the proportion of the tangential length of magnet 13 in the circumference of rotor core 1. This ensures that the tangential length of the magnet 13 is a suitable proportion of the circumference of the rotor core 1, avoiding both excessively long and short tangential lengths. On one hand, this results in a larger HPm, which increases magnetic field energy density, improves motor 100 efficiency, enhances demagnetization resistance, and improves motor 100 stability. Simultaneously, a larger tangential length of the magnet 13, while meeting magnetic requirements, allows for a reduction in the radial length of the magnet 13, thus reducing both the radial and tangential lengths of the rotor core 1 and lowering electromagnetic costs. On the other hand, it prevents the value of K from being too small, thereby avoiding an excessively large HPm that could negatively impact motor 100 performance.

[0060] In some embodiments of this utility model, such as Figure 2 As shown, Lpm and Hpm satisfy: The ratio can be 0.2, 0.3, 0.4, or 0.5, etc. This ensures that the ratio of Lpm to HPm is appropriate, thereby avoiding excessive radial length of the magnet 13, reducing the radial and tangential lengths of the rotor core 1, and thus reducing electromagnetic costs.

[0061] In some embodiments of this utility model, the maximum dimension of the rotor unit 11 is W2 in the direction perpendicular to the centerline of the rotor unit 11 and the axial direction of the rotor core 1, and W2 and HPm satisfy: For example The value can be 0.4, 0.5, 0.6, or 0.8, etc., thereby ensuring that the tangential length of the magnet 13 is a suitable proportion of the circumference of the rotor core 1, avoiding the magnet 13 being too long or too short. On the one hand, this allows for a larger HPm, which can increase the magnetic field energy density, improve the efficiency of the motor 100, enhance its anti-demagnetization capability, and improve the stability of the motor 100. At the same time, a larger tangential length of the magnet 13, while meeting magnetic requirements, can reduce the radial length of the magnet 13, thereby reducing the radial and tangential lengths of the rotor core 1 and lowering electromagnetic costs. On the other hand, it avoids the value of K being too small, thus preventing HPm from being too large and affecting the performance of the motor 100.

[0062] In some embodiments of this utility model, such as Figure 2 and Figure 4 As shown, the rotor assembly 10 also includes: an inner rotor core 2, which is located radially inside the rotor core 1. The inner rotor core 2 has a shaft hole, and the outer peripheral wall of the inner rotor core 2 has a groove 21. There are multiple grooves 21, which are arranged at intervals along the circumferential direction of the inner rotor core 2. The grooves 21 penetrate the inner rotor core 2 along the axial direction of the inner rotor core 2.

[0063] It is understandable that the inner rotor core 2 and the rotor core 1 are connected via injection molding. The groove 21 improves the reliability of the injection molding process, thereby enhancing the connection reliability between the inner rotor core 2 and the rotor core 1. The presence of multiple grooves 21 further improves the connection reliability between the inner rotor core 2 and the rotor core 1.

[0064] Furthermore, such as Figure 2 and Figure 4 As shown, in a cross section perpendicular to the axis of the inner rotor core 2, the outer contour shape of the groove 21 can be circular, elliptical, polygonal, elongated, dovetail, or other shapes.

[0065] Furthermore, such as Figure 2 and Figure 4 As shown, in the radially inward direction of the inner rotor core 2, the inner peripheral walls of the groove 21 gradually move closer to each other or gradually move further away from each other, thereby further improving the connection reliability between the inner rotor core 2 and the rotor core 1.

[0066] In some embodiments of this utility model, such as Figure 2 and Figure 4 As shown, the maximum distance between the outer peripheral wall of the inner rotor core 2 and the axis of the inner rotor core 2 is D4 / 2, and D1 and D4 satisfy: For example The value can be 2.5, 2.6, 2.8, or 3.5, etc. This ensures that the ratio between the maximum distance between the outer peripheral wall of the inner rotor core 2 and the axis of the inner rotor core 2 and the outer diameter of the rotor core 1 is appropriate. This guarantees the structural strength of the inner rotor core 2 while preventing it from becoming too large, thus maintaining the appropriate gap between the inner rotor core 2 and the rotor core 1 to avoid installation interference. Simultaneously, it ensures the injection molding strength between the inner rotor core 2 and the rotor core 1, guaranteeing the reliability of the connection between them.

[0067] In some embodiments of this utility model, such as Figure 2 and Figure 4 As shown, the maximum distance between the outer peripheral wall of the inner rotor core 2 and the axis of the inner rotor core 2 is D4 / 2, and the minimum distance between the inner peripheral wall of the inner rotor core 2 and the axis of the inner rotor core 2 is D5 / 2. D4 and D5 satisfy: For example The values ​​can be 2, 2.1, 2.2, 2.4, or 2.5, etc. This ensures that the ratio between the maximum distance between the outer peripheral wall of the inner rotor core 2 and the axis of the inner rotor core 2, and the minimum distance between the inner peripheral wall of the inner rotor core 2 and the axis of the inner rotor core 2, is appropriate. This guarantees the strength of the inner rotor core 2 while avoiding excessive material usage, which would increase cost and weight.

[0068] The following is for reference. Figure 1 A motor 100 according to an embodiment of the present utility model is described.

[0069] like Figure 1 As shown, the motor 100 according to an embodiment of the present invention includes: a stator 20 and the rotor assembly 10 described above.

[0070] Specifically, refer to Figure 1 The stator 20 includes a stator core 201, which includes a yoke 203 and a plurality of teeth 202. The plurality of teeth 202 are disposed on the inner peripheral wall of the yoke 203 and are spaced apart along the circumferential direction of the yoke 203. A stator slot 204 is defined between two adjacent teeth 202. The rotor assembly 10 is rotatably disposed in the stator core 201.

[0071] According to the embodiment of the present invention, the motor 100, by setting the rotor assembly 10 described above, includes a rotor core 1 comprising 2p rotor units 11 arranged along the circumferential direction of the rotor core 1, with a magnet slot 12 defined between two adjacent rotor units 11, and the outer diameter of the rotor core 1 being D1; there are 2p magnets 13, each disposed within one of the 2p magnet slots 12, with a radial length of Lpm and a tangential length of Hpm, and the minimum distance between the radial inner end face of the magnet 13 and the axis of the rotor core 1 being D2 / 2, wherein D1, D2, p, Lpm, and Hpm satisfy the following: This allows for a smaller value for K, resulting in a larger HPm, which increases the magnetic field energy density, improves the efficiency of motor 100, enhances its resistance to demagnetization, and improves its stability. Simultaneously, a larger tangential length for magnet 13 allows for a reduction in the radial length of magnet 13, as well as the radial and tangential lengths of rotor core 1, while still meeting magnetic requirements, thereby reducing electromagnetic costs.

[0072] In some embodiments of this utility model, the minimum distance between the radial inner end of the tooth 202 and the axis of the stator core 201 in the projection on the plane perpendicular to the axis of the stator core 201 is D3 / 2, where D3 and Hpm satisfy: For example It can be 2, 2.5, 3 or 4. It should be noted that 100 in the formula is the magnification ratio coefficient, which is used to amplify the ratio of π×D3 and Hpm.

[0073] It is understandable that π×D3 is the inner circumference of the stator core 201, and the ratio of HPm to π×D3 represents the proportion of the tangential length of the magnet 13 in the inner circumference of the stator core 201. This ensures that the tangential length of the magnet 13 is a suitable proportion of the inner circumference of the stator core 201, avoiding both excessively long and short tangential lengths. On one hand, this results in a larger HPm, increasing magnetic field energy density, improving motor 100 efficiency, enhancing demagnetization resistance, and enhancing motor 100 stability. Simultaneously, a larger tangential length of the magnet 13, while meeting magnetic requirements, allows for a reduction in the radial length of the magnet 13, thus reducing the radial and tangential lengths of the rotor core 1 and lowering electromagnetic costs. On the other hand, it prevents the value of K from being too small, thereby avoiding an excessively large HPm that could negatively impact motor 100 performance.

[0074] In some embodiments of this utility model, such as Figure 1 As shown, 2p satisfies: 2≤2p≤30; for example, 2p can be 2, 4, 5, 10, or 30, etc. This allows the number of poles of motor 100 to be within a reasonable range. Appropriate selection of the number of poles can optimize the magnetic circuit design of motor 100, reduce magnetic resistance and leakage flux, thereby improving the efficiency of motor 100.

[0075] In some embodiments of this utility model, such as Figure 1 As shown, the number of stator slots 204 ranges from 3 to 30. For example, the number of stator slots 204 can be 3, 4, 5, 6, 10, or 30, etc. This ensures that the number of stator slots 204 is appropriate. A reasonable number of stator slots 204 can improve the magnetic field distribution of the stator windings 20, making the magnetic field more uniform and reducing harmonic content. This helps to reduce iron losses and copper losses in the motor 100 and improve efficiency.

[0076] Furthermore, such as Figure 1 As shown, 2p satisfies: 2≤2p≤30. By appropriately selecting the number of poles and the values ​​of stator slots 204, the efficiency of motor 100 can be improved. For example, commonly used values ​​for 2p are 8, 10, 12, and 14, and the number of stator slots 204 is commonly 9 or 12, thus enabling the formation of 8-pole 9-slot motor 100, 8-pole 12-slot motor 100, 10-pole 9-slot motor 100, 10-pole 12-slot motor 100, etc.

[0077] The compressor according to an embodiment of the present invention is described below.

[0078] The compressor according to an embodiment of the present invention includes the motor 100 described above.

[0079] According to the compressor of this utility model embodiment, by setting the above-mentioned motor 100 and rotor assembly 10, the rotor core 1 includes 2p rotor units 11 arranged along the circumferential direction of the rotor core 1, and a magnet slot 12 is defined between two adjacent rotor units 11. The outer diameter of the rotor core 1 is D1; ​​there are 2p magnets 13, which are respectively disposed in the 2p magnet slots 12. The radial length of the magnet 13 is Lpm, the tangential length of the magnet 13 is Hpm, and the minimum distance between the radial inner end face of the magnet 13 and the axis of the rotor core 1 is D2 / 2. D1, D2, p, Lpm, and Hpm satisfy: This allows for a smaller value for K, resulting in a larger HPm, which increases the magnetic field energy density, improves the efficiency of motor 100, enhances its resistance to demagnetization, and improves its stability. Simultaneously, a larger tangential length for magnet 13 allows for a reduction in the radial length of magnet 13, as well as the radial and tangential lengths of rotor core 1, while still meeting magnetic requirements, thereby reducing electromagnetic costs.

[0080] The following describes a refrigeration device according to an embodiment of the present invention.

[0081] The refrigeration equipment according to an embodiment of the present invention includes the compressor described above.

[0082] According to the refrigeration equipment of this utility model embodiment, by setting the above-mentioned compressor, motor 100, and rotor assembly 10, the rotor core 1 includes 2p rotor units 11 arranged along the circumferential direction of the rotor core 1, and a magnetic slot 12 is defined between two adjacent rotor units 11. The outer diameter of the rotor core 1 is D1; ​​there are 2p magnets 13, which are respectively disposed in the 2p magnetic slots 12. The radial length of the magnet 13 is Lpm, the tangential length of the magnet 13 is Hpm, and the minimum distance between the radial inner end face of the magnet 13 and the axis of the rotor core 1 is D2 / 2. D1, D2, p, Lpm, and Hpm satisfy: This allows for a smaller value for K, resulting in a larger HPm, which increases the magnetic field energy density, improves the efficiency of motor 100, enhances its resistance to demagnetization, and improves its stability. Simultaneously, a larger tangential length for magnet 13 allows for a reduction in the radial length of magnet 13, as well as the radial and tangential lengths of rotor core 1, while still meeting magnetic requirements, thereby reducing electromagnetic costs.

[0083] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0084] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor assembly characterized by, include: The rotor core comprises 2p rotor units arranged along the circumferential direction of the rotor core, and a magnetic slot is defined between two adjacent rotor units. The outer diameter of the rotor core is D1. The rotor core contains 2p magnets, each disposed within a 2p magnet slot. The radial length of each magnet is Lpm, and the tangential length is Hpm. The minimum distance between the radially opposite inner end faces of two magnets along the rotor core is D2. The D1, the D2, the p, the Lpm and the Hpm satisfy: wherein the θ2 = θ3 - θ1, the The 2. The rotor assembly of claim 1, wherein The D1 and the Hpm satisfy: and / or, the Lpm and the Hpm satisfy:

3. The rotor assembly of claim 1, wherein In a direction perpendicular to the center line of the rotor unit and the axial direction of the rotor core, the maximum dimension of the rotor unit is W2, the W2 and the Hpm satisfy:

4. The rotor assembly of claim 1, wherein Also includes: An inner rotor core is located radially inside the rotor core. The inner rotor core has a shaft hole and a groove on its outer peripheral wall. There are multiple grooves, which are spaced apart along the circumferential direction of the inner rotor core and penetrate the inner rotor core along the axial direction of the inner rotor core.

5. The rotor assembly of claim 4, wherein, The maximum distance between the outer peripheral wall of the inner rotor core and the axis of the inner rotor core is D4 / 2, the D1 and the D4 satisfy: And / or, the maximum distance between the outer peripheral wall of the inner rotor core and the axis of the inner rotor core is D4 / 2, and the minimum distance between the inner peripheral wall of the inner rotor core and the axis of the inner rotor core is D5 / 2, wherein D4 and D5 satisfy:

6. An electric machine characterized by include: The stator includes a stator core, the stator core includes a yoke and a plurality of teeth, the plurality of teeth are disposed on the inner peripheral wall of the yoke and are spaced apart along the circumferential direction of the yoke, and a stator slot is defined between two adjacent teeth; The rotor assembly according to any one of claims 1-5 is rotatably disposed within the stator core.

7. The electric machine of claim 6, wherein, In a projection onto a plane perpendicular to the axis of the stator core, the minimum distance between the radially inner end of the tooth portion and the axis of the stator core is D3 / 2, said D3 and said Hpm satisfy:

8. The electric machine of claim 6, wherein, The 2p satisfies: 2≤2p≤30; And / or, the number of stator slots is 3-30.

9. A compressor characterized by, include: The motor according to any one of claims 6-8.

10. A refrigeration appliance characterized by, include: The compressor according to claim 9.

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